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

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https://hg.mozilla.org/integration/gaia-2_1/rev/b9f096d137aa
Author: Florin Strugariu <florin.strugariu@softvision.ro>
Desc: Merge pull request #25372 from viorelaioia/bug_1079254_v2.1

Bug 1079254 - [v2.2] Investigate test_number_keyboard intermittent failu...

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https://hg.mozilla.org/integration/gaia-2_1/rev/545c104a28bd
Author: Viorela Ioia <viorelaioia@gmail.com>
Desc: Bug 1079254 - [v2.2] Investigate test_number_keyboard intermittent failure
Bumping manifests a=b2g-bump