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

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https://hg.mozilla.org/integration/gaia-central/rev/3c1ff0ed875b
Author: Arnau <arnau@arnaumarch.com>
Desc: Merge pull request #19921 from rnowm/1019401

Bug 1019401 - [Contacts] Change import footer buttons to mach visual design r=jmcf

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https://hg.mozilla.org/integration/gaia-central/rev/cfbf6ccc671f
Author: rnowm <arnau@arnaumarch.com>
Desc: Bug 1019401 - [Contacts] Change import footer buttons to mach visual design

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https://hg.mozilla.org/integration/gaia-central/rev/274ad649711b
Author: Zac <zcampbell@mozilla.com>
Desc: Bug 1014590 - Unxfail test_lockscreen_unlock_to_camera a=testonly

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https://hg.mozilla.org/integration/gaia-central/rev/ebe6c3631036
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1018515 - Follow-up, adjust font size to match homescreen sizing r=me
Bumping manifests a=b2g-bump