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

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https://hg.mozilla.org/integration/gaia-central/rev/6f71c503fb26
Author: Ian Liu <iliu@mozilla.com>
Desc: Merge pull request #13457 from ian-liu/bluetooth/Bug935622_l10n__Modify_notification_message_of_transferring_request_to_be_more_clear_with_device_name

Bug 935622 - [l10n][Bluetooth File Transfer] Modify notification messageof transferring request to be more clear with device name, r=@alivedise

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https://hg.mozilla.org/integration/gaia-central/rev/05c24a3f0888
Author: ian-liu <iliu@mozilla.com>
Desc: Bug 935622 - [l10n][Bluetooth File Transfer] Modify notification message of transferring request to be more clear with device name