bump checkout and cache actions versions to v4

.github/workflows/testing.yml

@@ -32,13 +32,13 @@ jobs:
             phpstan: '1'
     steps:
       - name: Checkout Drupal core
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           repository: drupal/drupal
           ref: ${{ matrix.drupal-core }}
 
       - name: Checkout graphql module
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           path: modules/graphql
 
@@ -53,7 +53,7 @@ jobs:
           key: cache-v1
 
       - name: Cache PHP extensions
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
           path: ${{ steps.extcache.outputs.dir }}
           key: ${{ steps.extcache.outputs.key }}
@@ -73,7 +73,7 @@ jobs:
         run: echo "dir=$(composer config cache-files-dir)" >> $GITHUB_OUTPUT
 
       - name: Cache composer dependencies
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
           path: ${{ steps.composercache.outputs.dir }}
           # Use composer.json for key, if composer.lock is not committed.