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

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https://hg.mozilla.org/integration/gaia-central/rev/91e5760ff948
Author: Rudy Lu <me@rudy.lu>
Desc: Merge pull request #17268 from RudyLu/keyboard/Bug982568-re-enable_keyboard_OOP

Bug 982568 - Re-enable keyboard OOP.
r=timdream.

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https://hg.mozilla.org/integration/gaia-central/rev/dab8644cde59
Author: Rudy Lu <me@rudy.lu>
Desc: Bug 982568 - Re-enable keyboard OOP
Bumping manifests a=b2g-bump