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

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https://hg.mozilla.org/integration/gaia-central/rev/bd796917f945
Author: Etienne Segonzac <etienne@segonzac.info>
Desc: Merge pull request #26163 from kanru/bug-1098118

Bug 1098118 - Pass correct number of params to sendTouchEvent. r=alive

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https://hg.mozilla.org/integration/gaia-central/rev/312064446b5f
Author: Kan-Ru Chen (陳侃如) <kanru@kanru.info>
Desc: Bug 1098118 - Pass correct number of params to sendTouchEvent. r=alive
Bumping manifests a=b2g-bump