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

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https://hg.mozilla.org/integration/gaia-central/rev/5653991a8aa3
Author: George <georgeiscoming@gmail.com>
Desc: Merge pull request #14744 from cctuan/951067

Bug 951067 - [Video] No spinner when trying to view a video by activitie...

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https://hg.mozilla.org/integration/gaia-central/rev/d5dc562640e9
Author: cctuan <georgeiscoming@gmail.com>
Desc: Bug 951067 - [Video] No spinner when trying to view a video by activities