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

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https://hg.mozilla.org/integration/gaia-central/rev/fc8543b83930
Author: Guillaume C. Marty <gmarty@users.noreply.github.com>
Desc: Merge pull request #26741 from gmarty/Bug-1107355-Status-bar-turns-black-when-the-device-is-connected-with-another-device-via-Bluetooth

Bug 1107355 - [Status Bar][Bluetooth] Status bar turns black when the de...

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https://hg.mozilla.org/integration/gaia-central/rev/6ae80c97355a
Author: Guillaume Marty <edo999@gmail.com>
Desc: Bug 1107355 - [Status Bar][Bluetooth] Status bar turns black when the device is connected with another device via Bluetooth
Bumping manifests a=b2g-bump