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

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https://hg.mozilla.org/integration/gaia-central/rev/505727bb0593
Author: Zac <zcampbell@mozilla.com>
Desc: Merge pull request #15724 from bebef1987/cam_geo

Bug 959170 - Fix geolocation prompt in test_unlock_to_camera_with_passco...

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https://hg.mozilla.org/integration/gaia-central/rev/60bdba565da6
Author: Bebe <bebe@mozilla.ro>
Desc: Bug 959170 - Fix geolocation prompt in test_unlock_to_camera_with_passcode
Bumping manifests a=b2g-bump