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

========

https://hg.mozilla.org/integration/gaia-central/rev/7f0af1e164a3
Author: russnicoletti <rnicoletti@mozilla.com>
Desc: Merge pull request #19295 from russnicoletti/Bug-1002593

Bug 1002593 - Get 1.3t gallery image downsampling changes into master r=djf

========

https://hg.mozilla.org/integration/gaia-central/rev/f06ed00f7e75
Author: Russ Nicoletti <rnicoletti@mozilla.com>
Desc: Bug 1002593 - Get Gallery 1.3t image down-sampling changes into master
Bumping manifests a=b2g-bump