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

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https://hg.mozilla.org/integration/gaia-2_1/rev/3398cfba519a
Author: Arthur Chen <crh0716@gmail.com>
Desc: Merge pull request #26129 from crh0716/1098684

Bug 1098684 - Hide the AP PIN item r=eragonj
Bumping manifests a=b2g-bump