Bug fix: kartoza/pg-backup:14.0 not available (#363)

Changed to kartoza/pg-backup:14-3.1 to be consistent with version of db image (kartoza/postgis:14-3.1)

docker-compose.yml

@@ -26,7 +26,7 @@ services:
       test: "exit 0"
 
   dbbackups:
-    image: kartoza/pg-backup:14.0
+    image: kartoza/pg-backup:14-3.1
     hostname: pg-backups
     volumes:
       - dbbackups:/backups