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

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https://hg.mozilla.org/integration/gaia-2_0/rev/fadec35b21b2
Author: Ryan VanderMeulen <ryanvm@gmail.com>
Desc: Merge pull request #25643 from mancas/bug956902

Bug 956902 - [B2G][First Time Experience] User is able to access and bec...

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https://hg.mozilla.org/integration/gaia-2_0/rev/54dcc89625c6
Author: Manuel Casas <manuel.casasbarrado@telefonica.com>
Desc: Bug 956902 - [B2G][First Time Experience] User is able to access and become stuck in Settings app during FTU/FTE
Bumping manifests a=b2g-bump