Bumping gaia.json for 2 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-2_1/rev/64237056b619
Author: Michael Henretty <michael.henretty@gmail.com>
Desc: Merge pull request #25008 from mikehenrty/bug-1080362-appclosed-event

Bug 1080362 - Make sure we remove appclosed event listener

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https://hg.mozilla.org/integration/gaia-2_1/rev/832a86ba3ce5
Author: Michael Henretty <michael.henretty@gmail.com>
Desc: Bug 1080362 - Make sure we remove appclosed event listener
Bumping manifests a=b2g-bump