Upgrade actions/checkout to v4

Author: xavierfoucrier

.github/workflows/ci.yml

@@ -20,7 +20,7 @@ jobs:
         working-directory: code
     steps:
       - name: Checkout the repository
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Setup MSBuild
         uses: microsoft/setup-msbuild@v1

.github/workflows/sync-labels.yml

@@ -14,7 +14,7 @@ jobs:
   labels:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: micnncim/action-label-syncer@v1
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}