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

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https://hg.mozilla.org/integration/gaia-central/rev/8247d375fc5d
Author: Yura Zenevich <yura.zenevich@gmail.com>
Desc: Merge pull request #22332 from anvk/1030366

1030366: Hidden toolbar is not really hidden when editing contact, r=rik

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https://hg.mozilla.org/integration/gaia-central/rev/2cbe1b834ae9
Author: Alexey Novak <alexey.novak.mail@gmail.com>
Desc: 1030366: Hidden toolbar is not really hidden when editing contact, r=rik
Bumping manifests a=b2g-bump