Update mattermost to version v11.5.1 (#5100)

mattermost/docker-compose.yml

@@ -8,7 +8,7 @@ services:
       PROXY_AUTH_ADD: "false"
   
   app:
-    image: alexlack/mattermost-app:v11.4.2@sha256:2f4dec24e45032094a1b96a6078bddf67884390683f75ba8dad6b8e4bf95d7e3
+    image: alexlack/mattermost-app:v11.5.1@sha256:d4a5e15f60d418c4ccfd66d8027bd1da45817aadb4b8138dbd5777a240ac200f
     user: "1000:1000"
     restart: on-failure
     stop_grace_period: 1m
@@ -32,7 +32,7 @@ services:
         condition: service_healthy
 
   db:
-    image: alexlack/mattermost-db:v11.4.2@sha256:00a11114fad318705a9d0139fbbdc0eb6d607b2d6a39a4dc8f3f0bd189567f42
+    image: alexlack/mattermost-db:v11.5.1@sha256:1c7934aab0539feb953f6fe869ca9d98f1c9779f75c7c8a49b6f05d9394c88f0
     user: "1000:1000"
     restart: on-failure
     stop_grace_period: 1m

mattermost/umbrel-app.yml

@@ -3,7 +3,7 @@ id: mattermost
 name: Mattermost
 tagline: Team Chat, Open Source, Self-Hosted
 category: social
-version: "11.4.2"
+version: "11.5.1"
 port: 8765
 description: >-
   🚉 Mattermost is an open-source platform designed for secure collaboration throughout the software development lifecycle.
@@ -31,7 +31,12 @@ defaultUsername: ""
 defaultPassword: ""
 dependencies: []
 releaseNotes: >-
-  This release includes quality of life improvements and security fixes.
+  This release includes multiple new quality of life improvements, including:
+    - CJK Database Search for better multilingual support
+    - AI Channel Summarization to quickly catch up on conversations
+    - Agents Web Search capability
+    - User Authoritative Source support
+    - Channel Auto-Translation
 
 
   Full release notes are available at https://docs.mattermost.com/product-overview/mattermost-v11-changelog.html