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

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https://hg.mozilla.org/integration/gaia-central/rev/5ef0c4bb4ffa
Author: Jose M. Cantera <jmcanterafonseca@gmail.com>
Desc: Merge pull request #14250 from rnowm/contacts-highlight

Bug 917824 - [Contacts] Use Full Line Highlights

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https://hg.mozilla.org/integration/gaia-central/rev/30d53d9e096e
Author: rnowm <arnau@arnaumarch.com>
Desc: Bug 917824 - [Contacts] Use Full Line Highlights

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https://hg.mozilla.org/integration/gaia-central/rev/829777169c50
Author: Jose M. Cantera <jmcanterafonseca@gmail.com>
Desc: Merge pull request #14403 from rnowm/lists-highlight

Bug 946682 - fix lists [BB] to allow proper highlight in [Contacts] app

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https://hg.mozilla.org/integration/gaia-central/rev/0515dbcf7ab7
Author: rnowm <arnau@arnaumarch.com>
Desc: Bug 946682 - fix lists [BB] to allow proper highlight in [Contacts] app