Update actions/checkout action to v4 (#130)

Author: renovate[bot]

.github/workflows/GenerateAsyncCode.yml

@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
       with:
         ref: ${{ github.event.pull_request.head.ref }}
         repository: ${{ github.event.pull_request.head.repo.full_name }}