Update actions/checkout action to v3

Author: renovate[bot]

.github/workflows/ubuntu-22.04.yml

@@ -13,7 +13,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - name: Checkout
-      uses: actions/checkout@v2
+      uses: actions/checkout@v3
 
     - name: Set up Docker Buildx
       uses: docker/setup-buildx-action@v1