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

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https://hg.mozilla.org/integration/gaia-central/rev/f600dd437005
Author: Jose M. Cantera <jmcanterafonseca@gmail.com>
Desc: Merge pull request #14775 from jmcanterafonseca/fix_match_name_sim

Bug 917674 - [Contacts] Passive matching and merging when SIM contact's ...

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https://hg.mozilla.org/integration/gaia-central/rev/8a6a7f49c8b9
Author: Jose M. Cantera <jmcanterafonseca@gmail.com>
Desc: Bug 917674 - [Contacts] Passive matching and merging when SIM contact's name is the same than an addressbook contact's last name