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

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https://hg.mozilla.org/integration/gaia-2_0/rev/5896ff7f0eeb
Author: James Burke <jrburke@gmail.com>
Desc: Merge pull request #22908 from jrburke/bug1001629-email-notification-close-blank

Bug 1001629: email notification clear triggers failure in startup r=asuth
Bumping manifests a=b2g-bump