Change CI to use postgres 16 image

Author: jrafanie

.github/workflows/ci.yaml

@@ -22,7 +22,7 @@ jobs:
         - '3.3'
     services:
       postgres:
-        image: manageiq/postgresql:13
+        image: manageiq/postgresql:16-el10
         env:
           POSTGRESQL_USER: root
           POSTGRESQL_PASSWORD: smartvm