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

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https://hg.mozilla.org/integration/gaia-central/rev/ebbf1b0caafd
Author: Jose M. Cantera <jmcanterafonseca@gmail.com>
Desc: Merge pull request #20598 from jmcanterafonseca/num_dups_merged_sim_final

Bug 1026370 - SIM Import. User can't see message when contacts are merge...

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https://hg.mozilla.org/integration/gaia-central/rev/9b873dad7db8
Author: José Manuel Cantera <jmcanterafonseca@gmail.com>
Desc: Bug 1026370 - SIM Import. User can't see message when contacts are merged in import
Bumping manifests a=b2g-bump