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

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https://hg.mozilla.org/integration/gaia-central/rev/2adb6055c92d
Author: chirarobert <robert.chira@softvision.ro>
Desc: Merge pull request #25925 from zacc/bug_1074845

Bug 1074845 - Tackle test_add_contact_to_favorite.py intermittent with a...

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https://hg.mozilla.org/integration/gaia-central/rev/34c5d31fd113
Author: Zac <zcampbell@mozilla.com>
Desc: Bug 1074845 - Tackle test_add_contact_to_favorite.py intermittent with a stronger wait
Bumping manifests a=b2g-bump