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

========

https://hg.mozilla.org/integration/gaia-central/rev/7ad5e7400eac
Author: Ian Liu <iliu@mozilla.com>
Desc: Merge pull request #18930 from ian-liu/bluetooth/bug1003739_migrate_pairing_flow_from_settings_to_bluetooth_app

Bug 1003739 - [Settings][Bluetooth] Migrate pairing flow from settings to bluetooth app. r=@crh0716

========

https://hg.mozilla.org/integration/gaia-central/rev/70147058ed8c
Author: ian-liu <iliu@mozilla.com>
Desc: Bug 1003739 - [Settings][Bluetooth] Migrate pairing flow from settings to bluetooth app.
Bumping manifests a=b2g-bump