Enhancement: Update actions/checkout (#852)

Author: localheinz

.github/workflows/integrate.yaml

@@ -21,7 +21,7 @@ jobs:
 
     steps:
       - name: "Checkout"
-        uses: "actions/checkout@v3"
+        uses: "actions/checkout@v4"
 
       - name: "Set up PHP"
         uses: "shivammathur/setup-php@v2"
@@ -66,7 +66,7 @@ jobs:
 
     steps:
       - name: "Checkout"
-        uses: "actions/checkout@v3"
+        uses: "actions/checkout@v4"
 
       - name: "Set up PHP"
         uses: "shivammathur/setup-php@v2"