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

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https://hg.mozilla.org/integration/gaia-central/rev/d4e50e2dc054
Author: Ian Liu <iliu@mozilla.com>
Desc: Merge pull request #26759 from ian-liu/settings/bluetooth/bug1090041_no_onpairedstatuschanged_coming_after_paired/unpaired_device

Bug 1090041 - [Bluetooth] No onpairedstatuschanged event coming after paired/unpaired a device. r=arthur

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https://hg.mozilla.org/integration/gaia-central/rev/3d88c3767b59
Author: ian-liu <iliu@mozilla.com>
Desc: Bug 1090041 - [Bluetooth] No onpairedstatuschanged event coming after paired/unpaired a device.
Bumping manifests a=b2g-bump