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

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https://hg.mozilla.org/integration/gaia-2_1/rev/6934608cd236
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #25280 from KevinGrandon/bug_1084458_confirm_dialog_shb

Bug 1084458 - [Soft Home button] buttons on OTA screen confirmation are partially covered

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https://hg.mozilla.org/integration/gaia-2_1/rev/096e976246c3
Author: albertopq <albert.pastor@gmail.com>
Desc: Merge pull request #25220 from albertopq/1082917-clip-cbs

Bug 1082917 - Large message truncated on dialogs r=mhenretty
Conflicts:
	apps/system/test/marionette/lib/system.js

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https://hg.mozilla.org/integration/gaia-2_1/rev/6d0bc0b08c5a
Author: Michael Henretty <michael.henretty@gmail.com>
Desc: Merge pull request #25201 from mikehenrty/bug-1082071-unlock-trigger-resize

Bug 1082071 - Make unlocking screen trigger system resize when SHB enabl...
Bumping manifests a=b2g-bump