Update github actions version

Author: rlanvin

.github/workflows/tests.yml

@@ -11,7 +11,7 @@ jobs:
     name: PHP ${{ matrix.php }}
     steps:
     - name: Checkout
-      uses: actions/checkout@v2
+      uses: actions/checkout@v4
 
     - name: Install PHP
       uses: shivammathur/setup-php@v2
@@ -26,7 +26,7 @@ jobs:
 
     - name: Cache Composer packages
       id: composer-cache
-      uses: actions/cache@v2
+      uses: actions/cache@v4
       with:
         path: vendor
         key: ${{ matrix.php }}-composer