Bumping gaia.json for 4 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/e46590add368
Author: Jose M. Cantera <jmcanterafonseca@gmail.com>
Desc: Merge pull request #19068 from flodolo/bug998723

Bug 998723 - [Contacts] Add missing plural form to mergeActionButtonLabel

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https://hg.mozilla.org/integration/gaia-central/rev/b0685168b73b
Author: Francesco Lodolo (:flod) <flod@lodolo.net>
Desc: Bug 998723 - [Contacts] Add missing plural form to mergeActionButtonLabel

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https://hg.mozilla.org/integration/gaia-central/rev/e2cd512da790
Author: Jose M. Cantera <jmcanterafonseca@gmail.com>
Desc: Merge pull request #18836 from jmcanterafonseca/move_connectors

Bug 1003874 - [FTU-Separation] Move import connectors to shared

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https://hg.mozilla.org/integration/gaia-central/rev/53215b4b8045
Author: Jose M. Cantera <jmcanterafonseca@gmail.com>
Desc: Bug 1003874 - [FTU-Separation] Move import connectors to shared
Bumping manifests a=b2g-bump