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

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https://hg.mozilla.org/integration/gaia-central/rev/3ddf957b740f
Author: Yuren Ju <yurenju@gmail.com>
Desc: Merge pull request #16077 from RickyChien/issue-969301

Bug 969301 - Line number in coverage report looks weird r=@yurenju

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https://hg.mozilla.org/integration/gaia-central/rev/633bf3a57600
Author: Ricky Chien <ricky060709@gmail.com>
Desc: Bug 969301 - Line number in coverage report looks weird
Bumping manifests a=b2g-bump