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

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https://hg.mozilla.org/integration/gaia-central/rev/3ad420824af8
Author: AndreiH <andrei.hutusoru@softvision.ro>
Desc: Merge pull request #21874 from chirarobert/fix_imei_test

Bug 1040091 - [v2.1] Fix imei issue in test_settings_device_info.py

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https://hg.mozilla.org/integration/gaia-central/rev/2a7cecca04ae
Author: chirarobert <robert.chira@softvision.ro>
Desc: Bug 1040091 - [v2.1] Fix imei issue in test_settings_device_info.py
Bumping manifests a=b2g-bump