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

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https://hg.mozilla.org/integration/gaia-central/rev/61434fbec059
Author: Jose M. Cantera <jmcanterafonseca@gmail.com>
Desc: Merge pull request #25768 from jmcanterafonseca/fix_alpha_scroll

Bug 1076701 - [Contact] Improve UI on index circle for the Contact list

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https://hg.mozilla.org/integration/gaia-central/rev/1785c961f707
Author: Jose M. Cantera <jmcanterafonseca@gmail.com>
Desc: Bug 1076701 - [Contact] Improve UI on index circle for the Contact list
Bumping manifests a=b2g-bump