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

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https://hg.mozilla.org/integration/gaia-central/rev/68dba28a2316
Author: Cristian Rodriguez <crdlc@tid.es>
Desc: Merge pull request #19320 from crdlc/bug-1010352

Bug 1010352 - (vertical-homescreen) Add Pinch to Zoom to Settings

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https://hg.mozilla.org/integration/gaia-central/rev/0f9c2aacd36d
Author: crdlc <crdlc@tid.es>
Desc: Bug 1010352 - (vertical-homescreen) Add Pinch to Zoom to Settings
Bumping manifests a=b2g-bump