Merge pull request #35 from macguirerintoul/renovate/postgres-16.x

Update postgres Docker tag to v16

plausible/docker-compose.yml

@@ -1,7 +1,7 @@
 services:
   plausible_db:
     container_name: plausible-db
-    image: postgres:14-alpine
+    image: postgres:16-alpine
     restart: always
     volumes:
       - /mnt/containers/plausible/db-data:/var/lib/postgresql/data