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

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https://hg.mozilla.org/integration/gaia-central/rev/58ca1755c41f
Author: Guillaume C. Marty <gmarty@users.noreply.github.com>
Desc: Merge pull request #25663 from gmarty/Bug-1089451-Swiping-down-from-top-edge-when-utility-tray-is-already-open-and-it-closes

Bug 1089451 - Swiping down from top edge when utility tray is already op...

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https://hg.mozilla.org/integration/gaia-central/rev/a2d424171f84
Author: Guillaume Marty <edo999@gmail.com>
Desc: Bug 1089451 - Swiping down from top edge when utility tray is already open and it closes; quite opposite from gesture's movement
Bumping manifests a=b2g-bump