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

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https://hg.mozilla.org/integration/gaia-central/rev/63f7cdbe7785
Author: vingtetun <21@vingtetun.org>
Desc: Merge pull request #22447 from vingtetun/progress.misplaced

Bug 1047822 - Loading indicator is misplaced. r=me

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https://hg.mozilla.org/integration/gaia-central/rev/3862f266b632
Author: Vivien Nicolas <vnicolas@mozilla.com>
Desc: Bug 1047822 - Loading indicator is misplaced. r=me
Bumping manifests a=b2g-bump