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

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https://hg.mozilla.org/integration/gaia-central/rev/6d9f1087064f
Author: Cristian Rodriguez <crdlc@tid.es>
Desc: Merge pull request #19226 from crdlc/bug-1009729

Bug 1009729 - [B2G][Homescreen] Inconsistent flashing/non-flashing edit mode behavior when moving icons around the homescreen

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https://hg.mozilla.org/integration/gaia-central/rev/d1476c8de059
Author: crdlc <crdlc@tid.es>
Desc: Bug 1009729 - [B2G][Homescreen] Inconsistent flashing/non-flashing edit mode behavior when moving icons around the homescreen
Bumping manifests a=b2g-bump