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

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https://hg.mozilla.org/integration/gaia-central/rev/b663302329f2
Author: James Lal <james@lightsofapollo.com>
Desc: Merge pull request #12630 from lightsofapollo/revert-9d1a9fe

Revert "Merge pull request #12564 from gitmai/bug-880775-birthday-timezo...

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https://hg.mozilla.org/integration/gaia-central/rev/521b090f0150
Author: James Lal <james@lightsofapollo.com>
Desc: Revert "Merge pull request #12564 from gitmai/bug-880775-birthday-timezone"

This reverts commit 9d1a9fe8c40519f2bf7b558790a4df4d5b818ca3, reversing
changes made to 893bcd450ba60886a711e26a11d73aa3e88a1ee5.