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

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https://hg.mozilla.org/integration/gaia-central/rev/b52e77c53250
Author: albertopq <albert.pastor@gmail.com>
Desc: Merge pull request #23728 from albertopq/1061854-notif-swipe-animation

Bug 1061854 - Dismiss notification swiping up r=mhenretty

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https://hg.mozilla.org/integration/gaia-central/rev/6404f0d935a2
Author: albertopq <apastor@mozilla.com>
Desc: Bug 1061854 - Dismiss notifications
Bumping manifests a=b2g-bump