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

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https://hg.mozilla.org/integration/gaia-central/rev/5b62289f2d63
Author: AndreiH <andrei.hutusoru@softvision.ro>
Desc: Merge pull request #21584 from viorelaioia/924835

Bug 924835 - Create a test for receiving a call with a locked screen

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https://hg.mozilla.org/integration/gaia-central/rev/347d8af5014d
Author: Viorela Ioia <viorelaioia@gmail.com>
Desc: Bug 924835 - Create a test for receiving a call with a locked screen
Bumping manifests a=b2g-bump