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

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https://hg.mozilla.org/integration/gaia-central/rev/287d9c3b7b92
Author: Ryan VanderMeulen <ryanvm@gmail.com>
Desc: Merge pull request #24658 from mancas/bug1026306

Bug 1026306 - when mobile data isn't connected, wifi hotspot setting sil...

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https://hg.mozilla.org/integration/gaia-central/rev/22af8687b561
Author: Manuel Casas Barrado <manuel.casasbarrado@telefonica.com>
Desc: Bug 1026306 - when mobile data isn't connected, wifi hotspot setting silently fails and disables itself.r=alive
Bumping manifests a=b2g-bump