Update maildev/maildev Docker tag to v2.2.1 (#9410)

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

opencti-platform/opencti-dev/docker-compose.yml

@@ -46,7 +46,7 @@ services:
       - opencti-dev-elasticsearch
   opencti-dev-smtp:
     container_name: opencti-dev-smtp
-    image: maildev/maildev:2.1.0
+    image: maildev/maildev:2.2.1
     restart: unless-stopped
     ports:
       - 1025:1025