upgrade module to esm and update dependencies

[aiqiaoy]

The latest version of @actions/http-client, @actions/core and @actions/github packages are ESM only. We need to migrate checkout to ESM so we can update our dependencies to get the security fixes.

Mostly followed actions/upload-artifact#762

[Copilot]

Pull request overview

This PR migrates the actions/checkout TypeScript codebase and build/test tooling to ESM so it can consume newer ESM-only @actions/* packages (and related dependency updates) for security fixes.

Changes:

• Switch TypeScript compilation to NodeNext/ESM and update internal relative imports to use .js specifiers.
• Update build/test tooling for ESM (ncc entrypoint, Jest ESM config, updated tests/mocks).
• Bump @actions/* (and transitive Octokit) dependencies and refresh generated .licenses metadata.

Show a summary per file

File	Description
tsconfig.json	Moves TS compiler output to NodeNext/ESM settings and updates exclusions.
package.json	Declares ESM module type, updates build/test scripts, bumps dependencies, and requires Node >=24.
package-lock.json	Locks updated dependency graph for the ESM-only toolkit/Octokit updates.
jest.config.ts	Adds Jest configuration compatible with ESM + ts-jest.
jest.config.js	Removes CommonJS Jest config replaced by TS/ESM config.
dist/package.json	Ensures dist/ is treated as ESM for the bundled runtime output.
src/main.ts	Updates entrypoint for ESM and adjusts problem matcher registration/unregistration.
src/misc/generate-docs.ts	Replaces __dirname usage with import.meta.url-based resolution for ESM.
src/git-source-provider.ts	Updates internal imports for ESM .js specifiers.
src/git-auth-helper.ts	Updates internal imports for ESM .js specifiers.
src/git-command-manager.ts	Updates internal imports for ESM .js specifiers.
src/git-directory-helper.ts	Updates internal imports for ESM .js specifiers.
src/github-api-helper.ts	Updates internal imports for ESM .js specifiers.
src/input-helper.ts	Updates internal imports for ESM .js specifiers.
src/ref-helper.ts	Updates internal imports for ESM .js specifiers.
src/unsafe-pr-checkout-helper.ts	Updates internal imports for ESM .js specifiers.
src/url-helper.ts	Updates internal imports for ESM .js specifiers.
test/url-helper.test.ts	Updates test imports for ESM and uses ESM-friendly Jest globals.
test/unsafe-pr-checkout-helper.test.ts	Migrates mocking to jest.unstable_mockModule + dynamic imports for ESM.
test/retry-helper.test.ts	Migrates mocking to jest.unstable_mockModule + dynamic imports for ESM.
test/ref-helper.test.ts	Migrates mocking to jest.unstable_mockModule + dynamic imports for ESM.
test/input-helper.test.ts	Migrates mocking to jest.unstable_mockModule + dynamic imports for ESM.
test/github-api-helper.test.ts	Migrates mocking to jest.unstable_mockModule + dynamic imports for ESM.
test/git-version.test.ts	Updates test imports for ESM .js specifiers.
test/git-directory-helper.test.ts	Fixes __dirname usage for ESM and updates mocking approach.
test/git-command-manager.test.ts	Migrates mocking to jest.unstable_mockModule + dynamic imports for ESM.
test/git-auth-helper.test.ts	Fixes __dirname usage for ESM and updates mocking approach.
.licenses/npm/@actions/core.dep.yml	Updates licensed metadata for bumped @actions/core.
.licenses/npm/@actions/exec.dep.yml	Updates licensed metadata for bumped @actions/exec.
.licenses/npm/@actions/github.dep.yml	Updates licensed metadata for bumped @actions/github.
.licenses/npm/@actions/io.dep.yml	Updates licensed metadata for bumped @actions/io.
.licenses/npm/@actions/tool-cache.dep.yml	Updates licensed metadata for bumped @actions/tool-cache.
.licenses/npm/@actions/http-client-3.0.2.dep.yml	Updates licensed metadata for @actions/http-client (transitive).
.licenses/npm/@actions/http-client-4.0.1.dep.yml	Adds licensed metadata for @actions/http-client (direct).
.licenses/npm/@octokit/auth-token.dep.yml	Updates licensed metadata for bumped Octokit dependencies.
.licenses/npm/@octokit/core.dep.yml	Updates licensed metadata for bumped Octokit dependencies.
.licenses/npm/@octokit/endpoint.dep.yml	Updates licensed metadata for bumped Octokit dependencies.
.licenses/npm/@octokit/graphql.dep.yml	Updates licensed metadata for bumped Octokit dependencies.
.licenses/npm/@octokit/openapi-types.dep.yml	Updates licensed metadata for bumped Octokit dependencies.
.licenses/npm/@octokit/openapi-types-22.1.0.dep.yml	Removes outdated licensed metadata entry no longer present.
.licenses/npm/@octokit/plugin-paginate-rest.dep.yml	Updates licensed metadata for bumped Octokit dependencies.
.licenses/npm/@octokit/plugin-rest-endpoint-methods.dep.yml	Updates licensed metadata for bumped Octokit dependencies.
.licenses/npm/@octokit/request.dep.yml	Updates licensed metadata for bumped Octokit dependencies.
.licenses/npm/@octokit/request-error.dep.yml	Updates licensed metadata for bumped Octokit dependencies.
.licenses/npm/@octokit/types.dep.yml	Updates licensed metadata for bumped Octokit dependencies.
.licenses/npm/@octokit/types-13.4.1.dep.yml	Removes outdated licensed metadata entry no longer present.
.licenses/npm/before-after-hook.dep.yml	Updates licensed metadata for bumped transitive dependency.
.licenses/npm/content-type.dep.yml	Adds licensed metadata for new transitive dependency.
.licenses/npm/deprecation.dep.yml	Removes outdated licensed metadata entry no longer present.
.licenses/npm/json-with-bigint.dep.yml	Updates licensed metadata for new/updated transitive dependency.
.licenses/npm/once.dep.yml	Removes outdated licensed metadata entry no longer present.
.licenses/npm/semver.dep.yml	Updates licensed metadata for bumped transitive dependency.
.licenses/npm/undici.dep.yml	Updates licensed metadata for bumped transitive dependency.
.licenses/npm/universal-user-agent.dep.yml	Updates licensed metadata for bumped transitive dependency.
.licenses/npm/wrappy.dep.yml	Removes outdated licensed metadata entry no longer present.

Copilot's findings

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Comments suppressed due to low confidence (1)

.licenses/npm/@actions/http-client-3.0.2.dep.yml:7

• This dependency license entry uses license: other, but the repo’s .licensed.yml allowlist includes SPDX IDs like mit/isc and does not include other. This will likely cause npm run licensed-check to fail even though the embedded license text is clearly MIT. Consider changing the license identifier to mit (or otherwise aligning it with the allowlist).

• Files reviewed: 51/56 changed files
• Comments generated: 1