Bumping gaia.json for 3 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/219b3363067d
Author: Jose M. Cantera <jmcanterafonseca@gmail.com>
Desc: Merge pull request #21865 from jmcanterafonseca/fix_loop_contacts

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

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https://hg.mozilla.org/integration/gaia-central/rev/c7f10d482742
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

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https://hg.mozilla.org/integration/gaia-central/rev/e487a23b7756
Author: Anthony Ricaud <anthony@ricaud.me>
Desc: Bug 1034565 - CSSLint complains about CSS Variables r=vingtetun
Bumping manifests a=b2g-bump