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

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https://hg.mozilla.org/integration/gaia-2_1/rev/f6f29eaa731b
Author: chirarobert <robert.chira@softvision.ro>
Desc: Merge pull request #25606 from JohanLorenzo/bug-1086603-v2.1

Bug 1086603 - Add test test_browser_navigation.py to share a link to the...

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https://hg.mozilla.org/integration/gaia-2_1/rev/fdcefbcf0ea7
Author: Johan Lorenzo <jlorenzo@mozilla.com>
Desc: Bug 1086603 - Add test test_browser_navigation.py to share a link to the SMS app
Bumping manifests a=b2g-bump