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

========

https://hg.mozilla.org/integration/gaia-2_1/rev/6c7694e7f243
Author: Michael Henretty <michael.henretty@gmail.com>
Desc: Merge pull request #25150 from mikehenrty/bug-1082779-correct-b2g

Bug 1082779 - Use correct b2g-dekstop for make b2g, a=test-only

========

https://hg.mozilla.org/integration/gaia-2_1/rev/09a7be39346f
Author: Michael Henretty <michael.henretty@gmail.com>
Desc: Bug 1082779 - Use correct b2g-dekstop for make b2g, a=test-only
Bumping manifests a=b2g-bump