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

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https://hg.mozilla.org/integration/gaia-2_1/rev/23304159e863
Author: Bebe <bebe@mozilla.ro>
Desc: Bug 1065930 - Email test_setup_* failing due to HTML changes
Bumping manifests a=b2g-bump