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

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https://hg.mozilla.org/integration/gaia-central/rev/597e9db6ec1f
Author: Ian Liu <iliu@mozilla.com>
Desc: Merge pull request #19474 from ian-liu/bluetooth/bug859168_implement_user_story_for_imcoming_pairing_request_when_a_user_unlock_the_screen

Bug 859168 - [Settings][Bluetooth] fire a bluetooth pairing notification when lock screen turn on, r=@crh0716

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https://hg.mozilla.org/integration/gaia-central/rev/07e71ae7cf3e
Author: ian-liu <iliu@mozilla.com>
Desc: Bug 859168 - [Settings][Bluetooth] fire a bluetooth pairing notification when lock screen turn on
Bumping manifests a=b2g-bump