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

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https://hg.mozilla.org/integration/gaia-central/rev/4c92a31418ae
Author: Yuren Ju <yurenju@gmail.com>
Desc: Merge pull request #23783 from sudheesh001/Patch_1061577

Fixes Bug 1061577, Clears the blocker for other jshint error bugs in tests folder r=@yurenju

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https://hg.mozilla.org/integration/gaia-central/rev/734f2a97fbea
Author: sudheesh001 <sudheesh1995@outlook.com>
Desc: Fixes Bug 1061577, clears blocker for jshint in tests folder.
Bumping manifests a=b2g-bump