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

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https://hg.mozilla.org/integration/gaia-central/rev/6f9056216772
Author: Jose M. Cantera <jmcanterafonseca@gmail.com>
Desc: Merge pull request #21977 from jmcanterafonseca/fix_loop_contacts2

Bug 1017756 - Update Loop buttons & state (color, name, visibility...) i...

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https://hg.mozilla.org/integration/gaia-central/rev/e6f901e5ea92
Author: Jose M. Cantera <jmcanterafonseca@gmail.com>
Desc: Bug 1017756 - Update Loop buttons & state (color, name, visibility...) in contact details when a branding/UX decision is taken
Bumping manifests a=b2g-bump