Bumping gaia.json for 4 gaia revision(s) a=gaia-bump

========

https://hg.mozilla.org/integration/gaia-central/rev/f0bea3215781
Author: Ben Tian <btian@mozilla.com>
Desc: Merge pull request #20645 from bentian/bug-1026475

Bug 1026475 - Device switch from Handset/Headset to BTSCO fails during call, r=etienne

========

https://hg.mozilla.org/integration/gaia-central/rev/6d0ff818495a
Author: Ben Tian <btian@mozilla.com>
Desc: Bug 1026475 - Device switch from Handset/Headset to BTSCO fails during call, r=etienne

========

https://hg.mozilla.org/integration/gaia-central/rev/1733a553f3bb
Author: Rudy Lu <me@rudy.lu>
Desc: Merge pull request #20286 from RudyLu/ime/Bug1010026-uninstallation_test

Bug 1010026 - Add integration test to cover 3rd-party IME.
r=crh0716

========

https://hg.mozilla.org/integration/gaia-central/rev/02f5c3470401
Author: Rudy Lu <me@rudy.lu>
Desc: Bug 1010026 - Add integration test to cover 3rd-party IME
uninstallation.
Bumping manifests a=b2g-bump