MB 142: Prepare Mullvad Browser Release 12.0a10

rbm.conf

@@ -250,11 +250,12 @@ targets:
       Project_Name: 'Mullvad Browser'
       ProjectName: MullvadBrowser
       exe_name: mullvadbrowser
+      mar_channel_id: '[% c("var/projectname") %]-mullvad-[% c("var/channel") %]'
       locales: []
-      torbrowser_version: '12.0a9'
+      torbrowser_version: '12.0a10'
       torbrowser_build: 'build1'
       torbrowser_incremental_from:
-        - 12.0a8
+        - 12.0a9
 
   torbrowser-testbuild:
     - testbuild