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

========

https://hg.mozilla.org/integration/gaia-central/rev/bf1a57f891c0
Author: EragonJ <eragonj@eragonj.me>
Desc: Merge pull request #18471 from EragonJ/bug-973466

Bug 973466 - [settings] refactor wifi panel with AMD pattern

========

https://hg.mozilla.org/integration/gaia-central/rev/64a2ff79c756
Author: EragonJ <eragonj@eragonj.me>
Desc: Bug 973466 - [settings] refactor wifi panel with AMD pattern
Bumping manifests a=b2g-bump