Test Pulp 3.21 and 3.45 in integration tests

3.16 fails in some RPM tests.

Author: markgoddard

.github/workflows/pull_request.yml

@@ -16,8 +16,8 @@ jobs:
       fail-fast: false
       matrix:
         pulp:
-          - "3.16"
           - "3.21"
+          - "3.45"
     steps:
       # Checks-out the repository under $GITHUB_WORKSPACE, so it's accessible to the job
       - uses: actions/checkout@v3