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

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https://hg.mozilla.org/integration/gaia-2_0/rev/5460a7e4a4a7
Author: Yuren Ju <yurenju@gmail.com>
Desc: Merge pull request #23554 from yurenju/uuid-v2.0

Bug 1058555 - Updating preloaded apps in FOTA/OTA results in duplicate apps in /data/local/webapps r=gduan

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https://hg.mozilla.org/integration/gaia-2_0/rev/ac63281352a9
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