Bump actions/cache from 5 to 6 in the actions-dependencies group

Bumps the actions-dependencies group with 1 update: [actions/cache](https://github.com/actions/cache).


Updates `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
  dependency-group: actions-dependencies
...

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

Author: dependabot[bot]

.github/workflows/pull_request_validation.yml

@@ -36,7 +36,7 @@ jobs:
           sudo udevadm trigger --name-match=kvm
 
       - name: AVD Cache
-        uses: actions/cache@v5
+        uses: actions/cache@v6
         id: avd-cache
         with:
           path: |