Bump actions/cache from 3 to 4 (#16)

Bumps [actions/cache](https://github.com/actions/cache) from 3 to 4.
- [Release notes](https://github.com/actions/cache/releases)
- [Changelog](https://github.com/actions/cache/blob/main/RELEASES.md)
- [Commits](actions/cache@v3...v4)

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

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

.github/workflows/run-tests.yml

@@ -25,7 +25,7 @@ jobs:
 
             - name: Restore Composer dependencies
               id: cache-php
-              uses: actions/cache@v3
+              uses: actions/cache@v4
               with:
                   path: vendor
                   key: ${{ matrix.os }}-php-${{ matrix.php }}-${{ hashFiles('**/composer.lock') }}
@@ -57,7 +57,7 @@ jobs:
 
             - name: Restore Composer dependencies
               id: cache-php
-              uses: actions/cache@v3
+              uses: actions/cache@v4
               with:
                   path: vendor
                   key: ${{ matrix.os }}-php-${{ matrix.php }}-${{ hashFiles('**/composer.lock') }}