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

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https://hg.mozilla.org/integration/gaia-central/rev/c42c68c4f335
Author: Jared Hirsch <ohai@6a68.net>
Desc: Merge pull request #18460 from 6a68/bug-994911-coppa-error-raw-html

Bug 994911 - FxA COPPA message shows raw HTML

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https://hg.mozilla.org/integration/gaia-central/rev/0d962629e66b
Author: Jared Hirsch <ohai@6a68.net>
Desc: Bug 994911 - FxA COPPA message shows raw HTML r=ferjm
Bumping manifests a=b2g-bump