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

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https://hg.mozilla.org/integration/gaia-2_0/rev/4eb6536c6541
Author: Fabrice Desre <fabrice@desre.org>
Desc: Bug 1037030 - fix multiple prompt race r=alive

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https://hg.mozilla.org/integration/gaia-2_0/rev/716eb6a7e48c
Author: Guilherme Goncalves <guilherme.p.gonc@gmail.com>
Desc: Merge pull request #21948 from guilherme-pg/bug1040935-unverified-account

Bug1040935 unverified account
Bumping manifests a=b2g-bump