Update ghcr.io/maintainerr/maintainerr Docker tag to v3.12.1 (#861)

Change-type: minor

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

extras/docker-compose.yml

@@ -20,7 +20,7 @@ services:
   # https://docs.maintainerr.info/Installation/
   maintainerr:
     container_name: maintainerr
-    image: ghcr.io/maintainerr/maintainerr:3.11.2@sha256:bd71ca33bc1133437adf4bc4f4c074e1fc2905c5a6c640aa237cfe14d0f249db
+    image: ghcr.io/maintainerr/maintainerr:3.12.1@sha256:0778e0e691f91b5f01aeef0e7ada3bfc7837abd81846b3be0580f669ebc83518
     restart: unless-stopped
     environment:
       - TZ=${TZ}