Add stable-2.13 to GHA matrix (#51)

Author: Andersson007

.github/workflows/ansible-test.yml

@@ -11,6 +11,7 @@ jobs:
         - stable-2.10
         - stable-2.11
         - stable-2.12
+        - stable-2.13
         - devel
     runs-on: ubuntu-latest
     steps: