Upgrade to actions/cache@v4

Author: luispabon

.github/workflows/tests.yaml

@@ -25,7 +25,7 @@ jobs:
         run: |
           echo "dir=$(make composer-cache-dir)" >> $GITHUB_OUTPUT
 
-      - uses: actions/cache@v3
+      - uses: actions/cache@v4
         with:
           path: ${{ steps.composer-cache.outputs.dir }}
           key: ${{ runner.os }}-composer-${{ hashFiles('**/composer.lock') }}