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

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https://hg.mozilla.org/integration/gaia-central/rev/1ad36e0dfda9
Author: EragonJ <eragonj@eragonj.me>
Desc: Merge pull request #21008 from EragonJ/feature/settings-bundle

Bug 1033951 - [Settings] Allow Settings app embed a app in its own process

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https://hg.mozilla.org/integration/gaia-central/rev/f9db9d086407
Author: EragonJ <eragonj@eragonj.me>
Desc: Bug 1033951 - [Settings] Allow Settings app embed a app in its own process

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https://hg.mozilla.org/integration/gaia-central/rev/81d965847f9e
Author: Carsten Book <tomcat@mozilla.com>
Desc: Merge pull request #21821 from flodolo/bug998137

Bug 998137 - When Passcode is disabled, give more room to date/time. r=gweng

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https://hg.mozilla.org/integration/gaia-central/rev/415145fdbba0
Author: Francesco Lodolo (:flod) <flod@lodolo.net>
Desc: Bug 998137 - When Passcode is disabled, give more room to date/time, r=gweng, ui-review=amlee
Bumping manifests a=b2g-bump