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

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https://hg.mozilla.org/integration/gaia-central/rev/dcaa8e1f335c
Author: Jose M. Cantera <jmcanterafonseca@gmail.com>
Desc: Merge pull request #12662 from jmcanterafonseca/fix_sim_msg_no_contacts

Bug 923093 - No message while importing contacts from SIM when there are...

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https://hg.mozilla.org/integration/gaia-central/rev/b65779c10740
Author: Jose M. Cantera <jmcanterafonseca@gmail.com>
Desc: Bug 923093 - No message while importing contacts from SIM when there are no contacts