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

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https://hg.mozilla.org/integration/gaia-central/rev/c7851acf91df
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #22328 from KevinGrandon/bug_1037864_fix_locale_paths

Bug 1037864 - Follow-up, fix relative pathing of properties files

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https://hg.mozilla.org/integration/gaia-central/rev/2ab6fb68b362
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1037864 - Follow-up, fix relative pathing of properties files r=gandalf
Bumping manifests a=b2g-bump