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

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https://hg.mozilla.org/integration/gaia-2_1/rev/8be2b4af7e49
Author: Florin Strugariu <florin.strugariu@softvision.ro>
Desc: Merge pull request #24432 from viorelaioia/bug_1071592_v2.1

Bug 1071592 - Fix intermittent failure in test_keyboard.py

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https://hg.mozilla.org/integration/gaia-2_1/rev/b3defc7473bf
Author: Viorela Ioia <viorelaioia@gmail.com>
Desc: Bug 1071592 - Fix intermittent failure in test_keyboard.py
Bumping manifests a=b2g-bump