Bumping gaia.json for 3 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-2_1/rev/a3e4625b0e1c
Author: EragonJ (E.J.) <eragonj@eragonj.me>
Desc: Merge pull request #25687 from EragonJ/v2.1-bug-1089459

Bug 1089459 - [Settings] Performance regression on bug 1066830

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https://hg.mozilla.org/integration/gaia-2_1/rev/12fc77c5b1e5
Author: EragonJ <eragonj@eragonj.me>
Desc: Bug 1089459 - [Settings] Performance regression on bug 1066830

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https://hg.mozilla.org/integration/gaia-2_1/rev/50cd1d36a0f1
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Merge pull request #25753 from timdream/keyboard-aria-label2

Bug 1092911 - Correct aria-label for layout switching keys, r=rudyl
Conflicts:
	apps/keyboard/js/keyboard/layout_manager.js
	apps/keyboard/test/unit/keyboard/layout_manager_test.js
Bumping manifests a=b2g-bump