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

========

https://hg.mozilla.org/integration/gaia-central/rev/8ac788505789
Author: pacorampas <b.frv@tid.es>
Desc: Merge pull request #25397 from pacorampas/1087026

Bug 1087026 - [2.1][l10n][cost control] Multiple locales: the line "use data alert" is overlapped by the toggle switch r=arnau

========

https://hg.mozilla.org/integration/gaia-central/rev/3492c95135d1
Author: Paco Rampas <pacorampas@gmail.com>
Desc: Bug 1087026 - [2.1][l10n][cost control] Multiple locales: the line "use data alert" is overlapped by the toggle switch
Bumping manifests a=b2g-bump