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

========

https://hg.mozilla.org/integration/gaia-central/rev/5721f62e1ff3
Author: Kyle Machulis <kyle@nonpolynomial.com>
Desc: Merge pull request #15425 from qdot/960373-fte-tests

Bug 960363 - Add basic FTE tests

========

https://hg.mozilla.org/integration/gaia-central/rev/7125ac2b0cc6
Author: Kyle Machulis <kyle@nonpolynomial.com>
Desc: Bug 960363 - Add basic FTE tests
Bumping manifests a=b2g-bump