Update dependency bourbon-neat to v4

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
bourbon-neat (source)	dependencies	major	^2.1.0 -> ^4.0.0

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Release Notes

thoughtbot/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

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