Update test-php.yml

Author: vytisbulkevicius

.github/workflows/test-php.yml

@@ -25,7 +25,7 @@ jobs:
          run: |
            echo "::set-output name=dir::$(composer config cache-files-dir)"
        - name: Setup Composer cache
-         uses: actions/cache@v1
+         uses: actions/cache@v4
          with:
            path: ${{ steps.composer-cache.outputs.dir }}
            key: ${{ runner.os }}-composer-${{ hashFiles('**/composer.lock') }}