Nextcloud Talk: disable AUM

Until https://github.com/nextcloud/talk-android/issues/534 is solved.

metadata/com.nextcloud.talk2.yml

@@ -370,6 +370,7 @@ Builds:
 
   - versionName: 6.1.0
     versionCode: 102
+    disable: unknown maven repo 'https://dl.bintray.com/mdjanic/maven'
     commit: v6.1.0
     subdir: app
     gradle:
@@ -378,8 +379,10 @@ Builds:
       - app/gplay.gradle
     prebuild: sed -i -e '/work-firebase/d' build.gradle
 
+MaintainerNotes: https://github.com/nextcloud/talk-android/issues/534.
+
 ArchivePolicy: 5 versions
-AutoUpdateMode: Version v%v
+AutoUpdateMode: None
 UpdateCheckMode: Tags ^v[0-9]+\.[0-9]+\.[0-9]+$
 CurrentVersion: 6.1.0
 CurrentVersionCode: 102