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

========

https://hg.mozilla.org/integration/gaia-central/rev/5656596e1660
Author: GaryChen,PYChen <mmm198219@gmail.com>
Desc: Merge pull request #17710 from mpizza/Bug_979750_landed_in_master

Bug 979750 - [System2] "attention_screen" and "media_recording" missing "Applications". r=alive

========

https://hg.mozilla.org/integration/gaia-central/rev/eec429e5b1f0
Author: mpizza <mmm198219@gmail.com>
Desc: Bug 979750 - [System2] "attention_screen" and "media_recording" missing "Applications"
Bumping manifests a=b2g-bump