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

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https://hg.mozilla.org/integration/gaia-central/rev/d6f76aece652
Author: Florin Strugariu <bebef_1987@yahoo.com>
Desc: Merge pull request #21671 from chirarobert/fix_gmail_test

Bug 1038060 - [v2.1] Fix test_import_contacts_from_gmail failure

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https://hg.mozilla.org/integration/gaia-central/rev/d5ea739e7921
Author: chirarobert <robert.chira@softvision.ro>
Desc: Bug 1038060 - [v2.1] Fix test_import_contacts_from_gmail failure

Added a keyboard.dismiss before tapping on the sign in button.
Bumping manifests a=b2g-bump