Bumping gaia.json for 4 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-2_1/rev/731ea75a42e3
Author: Ryan VanderMeulen <ryanvm@gmail.com>
Desc: Merge pull request #24189 from cctuan/1064648-v21

Bug 1064648 - Hitting power button while the keyboard is invoked shows 1/2 of Homescreen

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https://hg.mozilla.org/integration/gaia-2_1/rev/89bf1e052386
Author: cctuan <georgeiscoming@gmail.com>
Desc: Bug 1064648 - Hitting power button while the keyboard is invoked shows 1/2 of Homescreen

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https://hg.mozilla.org/integration/gaia-2_1/rev/b3cde6d1b75c
Author: Ryan VanderMeulen <ryanvm@gmail.com>
Desc: Merge pull request #23830 from yurenju/uuid-v2.1

Bug 1058555 - Updating preloaded apps in FOTA/OTA results in duplicate a...

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https://hg.mozilla.org/integration/gaia-2_1/rev/df4049079a8e
Author: Yuren Ju <yurenju@gmail.com>
Desc: Bug 1058555 - Updating preloaded apps in FOTA/OTA results in duplicate apps in /data/local/webapps r=gduan
Bumping manifests a=b2g-bump