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

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https://hg.mozilla.org/integration/gaia-central/rev/339d12e755c9
Author: Yuren Ju <yurenju@gmail.com>
Desc: Merge pull request #22442 from sudheesh001/Patch_1032044

Fixes bug 1032044, Errors on build/webapp-manifests.js r=yurenju

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https://hg.mozilla.org/integration/gaia-central/rev/a399afd1b193
Author: sudheesh001 <sudheesh1995@outlook.com>
Desc: Fixes bug 1032044, Errors on build/webapp-manifests.js r=yurenju
Bumping manifests a=b2g-bump