build(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](actions/cache@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>

Author: dependabot[bot]

.github/workflows/static-analysis.yml

@@ -22,7 +22,7 @@ jobs:
         uses: ./.github/actions/setup-php-composer
 
       - name: Cache phpstan results
-        uses: actions/cache@v5
+        uses: actions/cache@v6
         with:
           path: .phpstan-cache
           key: "result-cache-${{ github.run_id }}" # always write a new cache
@@ -54,15 +54,15 @@ jobs:
         uses: ./.github/actions/setup-php-composer
 
       - name: Cache rector results
-        uses: actions/cache@v5
+        uses: actions/cache@v6
         with:
           path: /tmp/rector
           key: "rector-cache-${{ github.run_id }}" # always write a new cache
           restore-keys: |
             rector-cache-
 
       - name: Cache ecs results
-        uses: actions/cache@v5
+        uses: actions/cache@v6
         with:
           path: /tmp/ecs
           key: "ecs-cache-${{ github.run_id }}" # always write a new cache