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

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https://hg.mozilla.org/integration/gaia-central/rev/2e30644c60f4
Author: Borja Salguero <borjasalguero@users.noreply.github.com>
Desc: Merge pull request #19769 from borjasalguero/loop_contacts_integration

Bug 988392 - Allow Loop to be added to the contact details r=arcturus

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https://hg.mozilla.org/integration/gaia-central/rev/56d9ece6e424
Author: Francisco Jordano <fjordano@mozilla.com>
Desc: Bug 988392 - Allow Loop to be added to the contact details r=arcturus
Bumping manifests a=b2g-bump