Pick up new obfs4 bridge for mobile (#32547)

projects/tor-android-service/config

 # vim: filetype=yaml sw=2
 version: '[% c("abbrev") %]'
 filename: '[% project %]-[% c("version") %]-[% c("var/build_id") %]'
-git_hash: 1a2f8b9d7e4d10b2057eee0e68d5aacc5d26f8ae
+git_hash: 4a81e5806f36e7d0bf9492437d824599ecf4ff43
 git_url: https://git.torproject.org/tor-android-service.git
 git_submodule: 1