Bump actions/cache from 5 to 6 (#47)

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](actions/cache@v5...v6)

---
updated-dependencies:
- dependency-name: actions/cache
  dependency-version: '6'
  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/security.yml

@@ -26,7 +26,7 @@ jobs:
         run: |
           composer install --no-interaction
 
-      - uses: actions/cache@v5
+      - uses: actions/cache@v6
         id: cache-db
         with:
           path: ~/.symfony/cache