Fix CI (#19)

Upgrade actions to fix the CI

Author: BafS

.github/workflows/php.yml

@@ -12,14 +12,14 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
 
     - name: Validate composer.json and composer.lock
       run: composer validate
 
     - name: Cache Composer packages
       id: composer-cache
-      uses: actions/cache@v2
+      uses: actions/cache@v4
       with:
         path: vendor
         key: ${{ runner.os }}-node-${{ hashFiles('**/composer.lock') }}
@@ -30,8 +30,5 @@ jobs:
       if: steps.composer-cache.outputs.cache-hit != 'true'
       run: composer install --prefer-dist --no-progress --no-suggest
 
-    # Add a test script to composer.json, for instance: "test": "vendor/bin/phpunit"
-    # Docs: https://getcomposer.org/doc/articles/scripts.md
-
     - name: Run test suite
       run: composer run-script test