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

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https://hg.mozilla.org/integration/gaia-central/rev/da68670d0336
Author: vingtetun <21@vingtetun.org>
Desc: Merge pull request #23864 from vingtetun/tweak-cardsview-final

Bug 1061324 - Display the app chrome in the card view. r=sfoster

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https://hg.mozilla.org/integration/gaia-central/rev/9f4ddd9f4c09
Author: Vivien Nicolas <vnicolas@mozilla.com>
Desc: Bug 1061324 - Rework cards view into cards strip with app chrome. r=sfoster
Bumping manifests a=b2g-bump