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

========

https://hg.mozilla.org/integration/gaia-central/rev/8a07660865f6
Author: Ryan VanderMeulen <ryanvm@gmail.com>
Desc: Merge pull request #23798 from mancas/bug1025331

Bug 1025331 - [FTE] Change the "Next" button to "Skip" on the Firefox Ac...

========

https://hg.mozilla.org/integration/gaia-central/rev/dbee0919f109
Author: Manuel Casas Barrado <manuel.casasbarrado@telefonica.com>
Desc: Bug 1025331 - [FTE] Change the "Next" button to "Skip" on the Firefox Accounts screen during FTE
Bumping manifests a=b2g-bump