Bumping gaia.json for 1 gaia-1_2 revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-1_2/rev/53a1cdc9ce4b
Author: Eric O'Connor <eric@bocoup.com>
Desc: Bug 934722 - [clock] Unit tests compute timezone offset incorrectly - r=gnarf - a=npotb

Closes gh-13366
(cherry picked from commit 87dd80eb714529d65936abfb62831e5cdec2be3a)