chore(deps): bump actions/cache from 5 to 6

Bumps [actions/cache](https://github.com/actions/cache) from 5 to 6.
- [Release notes](https://github.com/actions/cache/releases)
- [Changelog](https://github.com/actions/cache/blob/main/RELEASES.md)
- [Commits](https://github.com/actions/cache/compare/v5...v6)

---
updated-dependencies:
- dependency-name: actions/cache
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/docs.yml

@@ -32,7 +32,7 @@ jobs:
 
       - name: Cache mdbook
         id: cache-mdbook
-        uses: actions/cache@v5
+        uses: actions/cache@v6
         with:
           path: ~/.cargo/bin/mdbook
           key: mdbook-0.5.2-${{ runner.os }}