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

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https://hg.mozilla.org/integration/gaia-central/rev/5053fecfe57e
Author: Michael Vines <mvines@codeaurora.org>
Desc: Merge pull request #16458 from mvines/bug962177

Bug 962177 - Ignore .git/ when packaging webapps. r=yurenju

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https://hg.mozilla.org/integration/gaia-central/rev/1ed7b4e0ff1c
Author: Michael Vines <mvines@codeaurora.org>
Desc: Bug 962177 - Ignore .git/ when packaging webapps
Bumping manifests a=b2g-bump