Bumping gaia.json for 2 gaia revision(s) a=gaia-bump

========

https://hg.mozilla.org/integration/gaia-central/rev/a544fcc0bf13
Author: Rudy Lu <me@rudy.lu>
Desc: Merge pull request #21410 from RudyLu/ime/Bug1024327-uninstall_keyboard_app

Bug 1024327 - Integration test for System input management after IME uninstallation.
r=evanxd.

========

https://hg.mozilla.org/integration/gaia-central/rev/87f72340a961
Author: Rudy Lu <me@rudy.lu>
Desc: Bug 1024327 - Integration test for System input management after IME
uninstallation.
Bumping manifests a=b2g-bump