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

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https://hg.mozilla.org/integration/gaia-2_1/rev/4bc88279e030
Author: Michael Henretty <michael.henretty@gmail.com>
Desc: Merge pull request #23924 from mikehenrty/bug-1065420-camera-theme

Bug 1065420 - Add theme color to camera

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https://hg.mozilla.org/integration/gaia-2_1/rev/4a91cad63643
Author: Michael Henretty <michael.henretty@gmail.com>
Desc: Merge pull request #23925 from mikehenrty/bug-1065419-gallery-theme

Bug 1065419 - Add theme color to gallery
Bumping manifests a=b2g-bump