Update dependency bourbon-neat to v4

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
bourbon-neat (source)	1.9.1 -> 4.0.0

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Release Notes

thoughtbot/neat (bourbon-neat)

v4.0.0

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Removed

• Installation through Bower is no longer supported.
• The sass gem (the deprecated Ruby Sass) is no longer a runtime dependency.

v3.0.1

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Fixed

• Fixed an issue that would cause Neat to not be found when using SassC.
• Fixed if function syntax error.

v3.0.0

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• Extend grid-media to accept multiple custom grids

v2.1.0

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Added

• A --path CLI option, which lets you install Neat into specific
  directory. (#​459)
• A style property has been added to our package.json, which makes for easy
  importing when using npm-sass, sass-module-importer and others. (#​514)

Fixed

• Fixed an issue that would cause Neat to not be found within Rails
  apps. (#​612)
• Simplified the gradient used in the grid-visual mixin for more consistent
  cross-browser behaviour. (#​569)

v2.0.0

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Fixed

• Custom grids inherit undefined properties from global $neat-grid
• Fixed instillation from CLI
• Remove float property from grid-collapse

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