Remove the checkout for testing the Action workflows

This emulates the behavior of running the Action in a different repository.

.github/workflows/test-create-bundle.yml

@@ -7,7 +7,6 @@ jobs:
     name: "Create custom bundle"
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
       - uses: advanced-security/codeql-bundle-action/download-bundle@v2
         id: download-bundle
         with: