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

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https://hg.mozilla.org/integration/gaia-central/rev/3a65abec09d8
Author: Zac Campbell <zcampbell@mozilla.com>
Desc: Bug 960240 - Re-enable test_persona_cookie.py as bug 963582 is resolved a=testonly r=me
Bumping manifests a=b2g-bump