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

========

https://hg.mozilla.org/integration/gaia-central/rev/e33cddfb7da2
Author: Etienne Segonzac <etienne@segonzac.info>
Desc: Merge pull request #23914 from etiennesegonzac/bug-1061324-follow-up

Bug 1061324 follow up - Intermittent fix and app closing hardening. r=21

========

https://hg.mozilla.org/integration/gaia-central/rev/6aeccb81e493
Author: Etienne Segonzac <etienne@segonzac.info>
Desc: Bug 1061324 follow up - Intermittent fix and app closing hardening.
Bumping manifests a=b2g-bump