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

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https://hg.mozilla.org/integration/gaia-central/rev/b6ce93c01bda
Author: Yuren Ju <yurenju@gmail.com>
Desc: Merge pull request #22835 from sudheesh001/Patch_1032033

Fixes Bug 1032033, build/test/integration/helper.js r=yurenju

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https://hg.mozilla.org/integration/gaia-central/rev/6013ce199eeb
Author: sudheesh001 <sudheesh1995@outlook.com>
Desc: Fixes Bug 1032033, build/test/integration/helper.js r=yurenju
Bumping manifests a=b2g-bump