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

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https://hg.mozilla.org/integration/gaia-central/rev/d7643b0dfd7a
Author: Yuren Ju <yurenju@gmail.com>
Desc: Merge pull request #15450 from yurenju/no-compression

Bug 957497 - Allow include of uncompressed data files in the package apps r=@timdream

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https://hg.mozilla.org/integration/gaia-central/rev/d0baa7bbed35
Author: Yuren Ju <yurenju@gmail.com>
Desc: Bug 957497 - Allow include of uncompressed data files in the package apps
Bumping manifests a=b2g-bump