Use Postgres 14 in workflow as 13 now EOL

Author: martinburchell

.github/workflows/im-build.yml

@@ -12,7 +12,7 @@ jobs:
     services:
       # Label used to access the service container
       postgres:
-        image: postgres:13
+        image: postgres:14
         env:
           POSTGRES_USER: postgres
           POSTGRES_PASSWORD: postgres