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

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https://hg.mozilla.org/integration/gaia-central/rev/293dc3236cfa
Author: Pavel Ivanov <pivanov@mozilla.com>
Desc: Merge pull request #11775 from samjoch/bug-906894-GalleryVideoPauseButtonNotCentered

Bug 906894 - [Gallery] Video pause buttons not centered

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https://hg.mozilla.org/integration/gaia-central/rev/658c5fa993b5
Author: Sam Joch <samuel@guiora.com>
Desc: Bug 906894 - [Gallery] Video pause buttons not centered