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

========

https://hg.mozilla.org/integration/gaia-2_1/rev/d959044816c2
Author: chirarobert <robert.chira@softvision.ro>
Desc: Merge pull request #25173 from viorelaioia/bug_1080557_v2.1

Bug 1080557 - Update test_browser_bookmark.py to delete the bookmark add...

========

https://hg.mozilla.org/integration/gaia-2_1/rev/e522ac247763
Author: Viorela Ioia <viorelaioia@gmail.com>
Desc: Bug 1080557 - Update test_browser_bookmark.py to delete the bookmark added
Bumping manifests a=b2g-bump