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

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https://hg.mozilla.org/integration/gaia-central/rev/64ba8e221101
Author: Jose M. Cantera <jmcanterafonseca@gmail.com>
Desc: Merge pull request #18733 from jmcanterafonseca/fix_regressions_ftu

Bug 1001488 - [B2G][Contacts] Unable to import SIM card contacts in Cont...

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https://hg.mozilla.org/integration/gaia-central/rev/ef65529248e2
Author: Jose M. Cantera <jmcanterafonseca@gmail.com>
Desc: Bug 1001488 - [B2G][Contacts] Unable to import SIM card contacts in Contacts app or FTU
Bumping manifests a=b2g-bump