ci, gha: Update actions/checkout actions

Author: hebasto

Diff for: .github/workflows/ci.yml

@@ -54,7 +54,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Clang version
         run: clang --version
@@ -105,7 +105,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Configure Developer Command Prompt for Microsoft Visual C++
         # Using microsoft/setup-msbuild is not enough.