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

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https://hg.mozilla.org/integration/gaia-central/rev/cf615d216008
Author: gitmai <mri@tid.es>
Desc: Merge pull request #16176 from gitmai/bug-970320-CC-add-movistar-uruguay

Bug 970320 -[Cost Control] Add configuration to provide top-up & check b...
r=salva

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https://hg.mozilla.org/integration/gaia-central/rev/e144d5e1386e
Author: mai <mri@tid.es>
Desc: Bug 970320 -[Cost Control] Add configuration to provide top-up & check balance in Movistar Uruguay

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https://hg.mozilla.org/integration/gaia-central/rev/4d55cd3f2688
Author: David Flanagan <dflanagan@mozilla.com>
Desc: Merge pull request #15890 from davidflanagan/bug956174

Bug 956174: copy the settings panel from system keyboard r=janjongboom

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https://hg.mozilla.org/integration/gaia-central/rev/f30d764e5730
Author: David Flanagan <dflanagan@mozilla.com>
Desc: Bug 956174: copy the settings panel from system keyboard
Bumping manifests a=b2g-bump