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

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https://hg.mozilla.org/integration/gaia-central/rev/8d552379ea17
Author: Ian Liu <iliu@mozilla.com>
Desc: Merge pull request #20415 from ian-liu/bluetooth/bug1017506_unpair_devices_dialog_could_be_closed_by_clicking_on_places_other_than_the_buttons

Bug 1017506 - [Settings][Bluetooth] The un-pair devices dialog(modal) could be closed by clicking on places other than the buttons, r=arthur

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https://hg.mozilla.org/integration/gaia-central/rev/b73ba9f40262
Author: ian-liu <iliu@mozilla.com>
Desc: Bug 1017506 - [Settings][Bluetooth] The un-pair devices dialog(modal) could be closed by clicking on places other than the buttons
Bumping manifests a=b2g-bump