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

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https://hg.mozilla.org/integration/gaia-central/rev/1e6be815a5bd
Author: Yuren Ju <yurenju@gmail.com>
Desc: Merge pull request #20398 from yurenju/intermittent-debug

Bug 1022196 - Intermittent build.test.js | Build Integration tests make ... r=testonly

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https://hg.mozilla.org/integration/gaia-central/rev/1a3a8c5519e7
Author: Yuren Ju <yurenju@gmail.com>
Desc: Bug 1022196 - Intermittent build.test.js | Build Integration tests make with DEBUG=1
Bumping manifests a=b2g-bump