Revert "chore(deps-dev): bump the vitest group with 4 updates"

[francinelucca]

Reverts #7378

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Latest commit: c7b802f

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[github-actions]

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👋 Hi, this pull request contains changes to the source code that github/github-ui depends on. If you are GitHub staff, test these changes with github/github-ui using the integration workflow. Check the integration testing docs for step-by-step instructions. Or, apply the integration-tests: skipped manually label to skip these checks.

[Copilot]

Pull request overview

This PR reverts #7378, rolling back the recent Vitest-related dev dependency upgrades and restoring the prior test setup expectations in @primer/react.

Changes:

• Downgrades vitest, @vitest/browser, @vitest/browser-playwright, and @vitest/eslint-plugin back to the previously pinned versions.
• Reverts TreeView browser test timer configuration back to vi.useFakeTimers() defaults.
• Updates package-lock.json to reflect the reverted dependency graph.

Reviewed changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated 1 comment.

File	Description
packages/react/src/TreeView/TreeView.test.tsx	Restores the prior fake-timers setup used by the TreeView browser-mode tests.
package.json	Reverts Vitest-related devDependency versions back to the pre-#7378 state.
package-lock.json	Aligns the lockfile with the reverted dependency versions and transitive deps.

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