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

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https://hg.mozilla.org/integration/gaia-central/rev/cd6ec24c7108
Author: Cristian Rodriguez <crdlc@tid.es>
Desc: Merge pull request #16298 from crdlc/bug-959414-master

Bug 959414 - [B2G][Contacts] Cancelling out of editing or Updating a con...

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https://hg.mozilla.org/integration/gaia-central/rev/312439340e5c
Author: crdlc <crdlc@tid.es>
Desc: Bug 959414 - [B2G][Contacts] Cancelling out of editing or Updating a contact after importing displays broken UI
Bumping manifests a=b2g-bump