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

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https://hg.mozilla.org/integration/gaia-central/rev/7e89bbbc62c3
Author: Guillaume C. Marty <gmarty@users.noreply.github.com>
Desc: Merge pull request #24139 from gmarty/Bug-1068204-Utility-Tray-Cannot-swipe-left-dismiss-notifications

Bug 1068204 - [Utility Tray] Cannot swipe left to dismiss notifications

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https://hg.mozilla.org/integration/gaia-central/rev/898752e20bc2
Author: Guillaume Marty <edo999@gmail.com>
Desc: Bug 1068204 - [Utility Tray] Cannot swipe left to dismiss notifications
Bumping manifests a=b2g-bump