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

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https://hg.mozilla.org/integration/gaia-central/rev/7ba3a41f4688
Author: Arnau <arnau@arnaumarch.com>
Desc: Merge pull request #18144 from rnowm/994498

Bug 994498 - [VR][BB] add white themed spinner to be used in [SMS] r=joan

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https://hg.mozilla.org/integration/gaia-central/rev/10e02af68d4f
Author: rnowm <arnau@arnaumarch.com>
Desc: Last Comment Bug 994498 - [VR][BB] add white themed spinner to be used in [SMS]
Bumping manifests a=b2g-bump