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

========

https://hg.mozilla.org/integration/gaia-central/rev/02304413231c
Author: Guillaume C. Marty <edo999@gmail.com>
Desc: Merge pull request #21770 from gmarty/Bug-1038722-Fix-notification-integration-tests

Bug 1038722 - Fix notification integration tests

========

https://hg.mozilla.org/integration/gaia-central/rev/ddc6a511033f
Author: Guillaume Marty <edo999@gmail.com>
Desc: Bug 1038722 - Fix notification integration tests
Bumping manifests a=b2g-bump