[TASK]: Bump actions/cache from 2 to 3

Bumps [actions/cache](https://github.com/actions/cache) from 2 to 3.
- [Release notes](https://github.com/actions/cache/releases)
- [Changelog](https://github.com/actions/cache/blob/main/RELEASES.md)
- [Commits](actions/cache@v2...v3)

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

Signed-off-by: dependabot[bot] <[email protected]>

.github/workflows/tests.yaml

@@ -42,7 +42,7 @@ jobs:
         run: |
           echo "::set-output name=dir::$(composer config cache-files-dir)"
       - name: Define Composer cache
-        uses: actions/cache@v2
+        uses: actions/cache@v3
         with:
           path: ${{ steps.composer-cache.outputs.dir }}
           key: tests-php-${{ matrix.php-version }}
@@ -116,7 +116,7 @@ jobs:
         run: |
           echo "::set-output name=dir::$(composer config cache-files-dir)"
       - name: Define Composer cache
-        uses: actions/cache@v2
+        uses: actions/cache@v3
         with:
           path: ${{ steps.composer-cache.outputs.dir }}
           key: tests-lowest-php-${{ matrix.php-version }}