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

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https://hg.mozilla.org/integration/gaia-2_0/rev/f58bbc6e00d5
Author: Jared Hirsch <ohai@6a68.net>
Desc: Merge pull request #20821 from 6a68/uplift-bug-1023419-to-v2

Bug 1023419 - Unify strings in Firefox Accounts and Find my device. r=ggp

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https://hg.mozilla.org/integration/gaia-2_0/rev/99ad3685a90c
Author: Nikhil Marathe <nsm.nikhil@gmail.com>
Desc: Bug 1023419 - Unify strings in Firefox Accounts and Find my device. r=ggp
Bumping manifests a=b2g-bump