feat: add ansible 2.15 and 2.18 to test matrix

Author: jackhodgkiss

.github/workflows/pull_request.yml

@@ -15,6 +15,8 @@ jobs:
       matrix:
         ansible:
           - "2.12"
+          - "2.15"
+          - "2.18"
     steps:
       # Checks-out the repository under $GITHUB_WORKSPACE, so it's accessible to the job
       - uses: actions/checkout@v3