chore(deps): update axllent/mailpit docker tag to v1.28.4

Author: renovate[bot]

docker-compose.yaml

@@ -23,7 +23,7 @@ services:
       - "127.0.0.1:5432:5432"
 
   mailpit:
-    image: "axllent/mailpit:v1.27.10"
+    image: "axllent/mailpit:v1.28.4"
     ports:
       - "1025:1025"
       - "8025:8025"