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

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https://hg.mozilla.org/integration/gaia-central/rev/fe6ba976047d
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Merge pull request #21534 from mancas/bug806227

Bug 806227 - Replace shortened forms of "don't" and "won't" with "do not...

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https://hg.mozilla.org/integration/gaia-central/rev/208cdbe918ca
Author: Manuel Casas Barrado <b.mcb@tid.es>
Desc: Bug 806227 - Replace shortened forms of "don't" and "won't" with "do not" and "will not" in descriptions in Settings app
Bumping manifests a=b2g-bump