Merge branch 'renovate/templates-lscr.io-linuxserver-heimdall-2021.x' into 'master'

Update lscr.io/linuxserver/heimdall Docker tag to v2021

See merge request !102

intern/docker_heimdall/templates/docker-compose.yml

@@ -4,7 +4,7 @@ version: "2.1"
 services:
 
   app:
-    image: lscr.io/linuxserver/heimdall:2.5.6
+    image: lscr.io/linuxserver/heimdall:2021.11.28
     restart: always
     environment:
       - PUID=1000