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

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https://hg.mozilla.org/integration/gaia-central/rev/b20c0f5d399c
Author: Cristian Rodriguez <crdlc@tid.es>
Desc: Merge pull request #24414 from crdlc/bug-1071632

Bug 1071632 - [Contacts] [ICE] ICE Group is not properly refreshed after...

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https://hg.mozilla.org/integration/gaia-central/rev/805fb69e2a99
Author: crdlc <crdlc@tid.es>
Desc: Bug 1071632 - [Contacts] [ICE] ICE Group is not properly refreshed after removing all phone numbers of an ICE Contact
Bumping manifests a=b2g-bump