Bumping gaia.json for 5 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/973d4fc6af8e
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #22125 from KevinGrandon/bug_1043599_app_titlebar_fullscreen

Bug 1043599 - Show app titlebar after swipe in fullscreen apps

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https://hg.mozilla.org/integration/gaia-central/rev/e03429d95d78
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1043599 - Show app titlebar after swipe in fullscreen apps r=alive

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https://hg.mozilla.org/integration/gaia-central/rev/1498745bae57
Author: Michael Henretty <michael.henretty@gmail.com>
Desc: Merge pull request #22230 from mikehenrty/Cwiiis-bug1044406-fix-tap-notification

Cwiiis bug1044406 fix tap notification

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https://hg.mozilla.org/integration/gaia-central/rev/3c76d25a38dc
Author: Michael Henretty <michael.henretty@gmail.com>
Desc: Bug 1044406 - Use tap event dispatch, add notification tap integration test

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https://hg.mozilla.org/integration/gaia-central/rev/2f62e2a4a5fe
Author: Chris Lord <chrislord.net@gmail.com>
Desc: Bug 1044406 - Fix not being able to tap a notification. r=mhenretty
Bumping manifests a=b2g-bump