chore(deps): bump actions/cache from 5.0.4 to 6.1.0 (#771)

Bumps [actions/cache](https://github.com/actions/cache) from 5.0.4 to 6.1.0.
- [Release notes](https://github.com/actions/cache/releases)
- [Changelog](https://github.com/actions/cache/blob/main/RELEASES.md)
- [Commits](actions/cache@6682284...55cc834)

---
updated-dependencies:
- dependency-name: actions/cache
  dependency-version: 6.1.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/docs.yml

@@ -30,7 +30,7 @@ jobs:
 
       - name: Cache phpDocumentor build files
         id: phpdocumentor-cache
-        uses: actions/cache@668228422ae6a00e4ad889ee87cd7109ec5666a7 # v5
+        uses: actions/cache@55cc8345863c7cc4c66a329aec7e433d2d1c52a9 # v5
         with:
           path: .phpdoc/cache
           key: ${{ runner.os }}-phpdocumentor-${{ github.sha }}