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

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https://hg.mozilla.org/integration/gaia-central/rev/6fff664db309
Author: Cristian Rodriguez <crdlc@tid.es>
Desc: Merge pull request #21166 from crdlc/bug-1032106

Bug 1032106 - [Vertical Homescreen] Pressing the home button returns to ...

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https://hg.mozilla.org/integration/gaia-central/rev/91d62f9c77b2
Author: crdlc <crdlc@tid.es>
Desc: Bug 1032106 - [Vertical Homescreen] Pressing the home button returns to top after showing context menu
Bumping manifests a=b2g-bump