Bump cssnano from 4.1.7 to 4.1.8

Created by: dependabot-preview[bot]

Bumps cssnano from 4.1.7 to 4.1.8.

Release notes

Sourced from cssnano's releases.

v4.1.8

4.1.8

Performance Improvements

• initial loading time (require('cssnano')).

Bug Fixes

• postcss-merge-longhand correctly merging border properties with custom properties.

Commits

• 2a05dd4 chore(release): 4.1.8
• de2ef07 fix: initial loading time (#654)
• d804958 Release css-size v4.0.1.
• 81194c3 Update to lerna 3.
• 528af36 Update to lerna 3.
• 9aa2731 fix: preserve case of css custom variables. Fixes #648 (#649)
• 4bb8d5e fix: bug in merging border properties with custom properties (#653)
• See full diff in compare view

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