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

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https://hg.mozilla.org/integration/gaia-central/rev/02f2c731236d
Author: chirarobert <robert.chira@softvision.ro>
Desc: Merge pull request #27042 from mwargers/test_rocketbar_add_collection_save_bookmark

Bug 1116111 - test_rocketbar_add_collection_save_bookmark.py is skipped ...

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https://hg.mozilla.org/integration/gaia-central/rev/876d06cc2357
Author: Martijn Wargers <mwargers@mozilla.com>
Desc: Bug 1116111 - test_rocketbar_add_collection_save_bookmark.py is skipped on b2g desktop
Bumping manifests a=b2g-bump