deps(deps): update actions/checkout action to v4.1.6

Author: renovate[bot]

.github/workflows/testing.yml

@@ -28,7 +28,7 @@ jobs:
           - locked
     steps:
       - name: 📦 Check out the codebase
-        uses: actions/checkout@v4.1.5
+        uses: actions/checkout@v4.1.6
 
       - name: 🛠️ Setup PHP
         uses: shivammathur/setup-php@2.30.4
@@ -92,7 +92,7 @@ jobs:
           - locked
     steps:
       - name: 📦 Check out the codebase
-        uses: actions/checkout@v4.1.5
+        uses: actions/checkout@v4.1.6
 
       - name: 🛠️ Setup PHP
         uses: shivammathur/setup-php@2.30.4