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

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https://hg.mozilla.org/integration/gaia-central/rev/bb883e4e18ab
Author: Rudy Lu <me@rudy.lu>
Desc: Merge pull request #25072 from RudyLu/keyboard/bug1077124

Bug 1077124 - [Contacts] Number pad keyboard remains visible...
r=timdream.

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https://hg.mozilla.org/integration/gaia-central/rev/ce8c94635a26
Author: Rudy Lu <me@rudy.lu>
Desc: Bug 1077124 - [Contacts] Number pad keyboard remains visible when
switching from phone number field to name field.
 - Should not clear dataPromise while the switchCurrentIMEngine call is
   not complete.
Bumping manifests a=b2g-bump