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

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https://hg.mozilla.org/integration/gaia-central/rev/23feb2031185
Author: Yuren Ju <yurenju@gmail.com>
Desc: Merge pull request #20794 from yurenju/metadata

Bug 963463 - Employ easier logic for determining external apps r=@cctuan

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https://hg.mozilla.org/integration/gaia-central/rev/e2da258902c8
Author: Yuren Ju <yurenju@gmail.com>
Desc: Bug 963463 - Employ easier logic for determining external apps
Bumping manifests a=b2g-bump