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

========

https://hg.mozilla.org/integration/gaia-central/rev/985e02718711
Author: Etienne Segonzac <etienne@segonzac.info>
Desc: Merge pull request #24392 from etiennesegonzac/bug-1072392-render-optims

Bug 1072392 - Optimising AppWindow#render with a contextual fragment. r=alive

========

https://hg.mozilla.org/integration/gaia-central/rev/7c02a89c6d46
Author: Etienne Segonzac <etienne@segonzac.info>
Desc: Bug 1072392 - Optimising AppWindow#render with a contextual fragment.
Bumping manifests a=b2g-bump