GitHub: Update CI's checkout step version to v4 (#14749)

Author: 0x5bfa

.github/workflows/ci.yml

@@ -57,7 +57,7 @@ jobs:
     steps:
 
     - name: Checkout the repository
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
       with:
         fetch-depth: 2
 

.github/workflows/deploy-preview.yml

@@ -26,7 +26,7 @@ jobs:
 
     steps:
     - name: Checkout the repository
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
 
     - name: Setup MSBuild
       uses: microsoft/setup-msbuild@v1