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

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https://hg.mozilla.org/integration/gaia-central/rev/db069a8ba1b2
Author: Julien Wajsberg <felash@gmail.com>
Desc: Merge pull request #25295 from julienw/1016731-fix-page-test

Bug 1016731 - Intermittent page_test.js | page.js > page > appendIcon > ...

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https://hg.mozilla.org/integration/gaia-central/rev/f63d4255bcc6
Author: Julien Wajsberg <felash@gmail.com>
Desc: Bug 1016731 - Intermittent page_test.js | page.js > page > appendIcon > "after all" hook | TypeError: GridManager is null r=crdlc
Bumping manifests a=b2g-bump