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

========

https://hg.mozilla.org/integration/gaia-central/rev/8e78457d5414
Author: Jared Hirsch <ohai@6a68.net>
Desc: Merge pull request #18657 from 6a68/bug-980638-fxa-ftu-reset-password-fix

Bug 980638 - Show error message on forgot password click in FxA during FTU

========

https://hg.mozilla.org/integration/gaia-central/rev/f9519a1b04f2
Author: Jared Hirsch <ohai@6a68.net>
Desc: Bug 980638 - Show error message on forgot password click in FxA during FTU r=ferjm

  * Also prevents opening an unclosable web browser from COPPA error screen
    in the FxA FTU flow.
Bumping manifests a=b2g-bump