Update actions/checkout action to v4

.github/workflows/anchore.yml

@@ -32,7 +32,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - name: Check out the code
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
     - name: Build the Docker image
       run: docker build . --file Dockerfile --tag localbuild/testimage:latest
     - name: Run the Anchore Grype scan action