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

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https://hg.mozilla.org/integration/gaia-central/rev/91ea180532b3
Author: Min-Zhong "John" Lu <jlu@mozilla.com>
Desc: Merge pull request #23347 from mnjul/revert_1024298

Revert "Bug 1024298 - [Keyboard UX update] Show the full symbol panel for type="number""

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https://hg.mozilla.org/integration/gaia-central/rev/aa31b677183a
Author: John Lu [:mnjul] <jlu@mozilla.com>
Desc: Revert "Bug 1024298 - [Keyboard UX update] Show the full symbol panel for type="number""

This reverts commit 8763293e39d5121000c3b9b76b1583865442ae39.
Bumping manifests a=b2g-bump