[Mattermost] Bump to 5.21.0

pica-mattermost/Dockerfile

@@ -4,7 +4,7 @@ FROM alpine:3.11
 ENV PATH="/mattermost/bin:${PATH}"
 
 # Picasoft : change these values. The team version is used by default
-ENV MM_VERSION=5.20.1
+ENV MM_VERSION=5.21.0
 # Get these ids with the output of `id mattermost` on the VM hosting the app
 ARG PUID=5000
 ARG PGID=5000

pica-mattermost/docker-compose.yml

@@ -16,7 +16,7 @@ volumes:
 
 services:
   mattermost:
-    image: registry.picasoft.net/pica-mattermost:5.20.1
+    image: registry.picasoft.net/pica-mattermost:5.21.0
     container_name: mattermost-app
     links:
       - mattermost-db:mattermost-db