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

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https://hg.mozilla.org/integration/gaia-central/rev/8879d60a0cc3
Author: albertopq <albert.pastor@gmail.com>
Desc: Merge pull request #26402 from albertopq/1100157-ambient-pointer

Bug 1100157 - Utility tray is hard to pull with ambient indicator r=etienne_s

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https://hg.mozilla.org/integration/gaia-central/rev/3703e3467c4f
Author: albertopq <albert.pastor@gmail.com>
Desc: Bug 1100157 - Utility tray is hard to pull with ambient indicator
Bumping manifests a=b2g-bump