Prepare release 4.0.5

[Link-]

Updates the @actions/cache package to version 4.0.5 and addresses a runtime dependency issue. The main change is the reintroduction of the @protobuf-ts/runtime-rpc package as a runtime dependency, which resolves a faulty patch in the previous release.

[Copilot]

Pull Request Overview

This PR prepares the @actions/cache package for release version 4.0.5, addressing a runtime dependency issue that was introduced in the faulty 4.0.4 release. The fix involves reintroducing the @protobuf-ts/runtime-rpc package as a runtime dependency, which had been incorrectly moved to dev dependencies in the previous version.

• Version bump from 4.0.4 to 4.0.5
• Addition of release notes documenting the dependency fix and marking 4.0.4 as faulty

Reviewed Changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated no comments.

File	Description
packages/cache/package.json	Updates package version to 4.0.5
packages/cache/RELEASES.md	Adds release notes for 4.0.5 and marks 4.0.4 as faulty

Files not reviewed (1)

• packages/cache/package-lock.json: Language not supported