RenovateBot: Update dependency cssnano to v7.1.1

This MR contains the following updates:

Package	Type	Update	Change
cssnano	dependencies	patch	7.1.0 -> 7.1.1

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Release Notes

cssnano/cssnano (cssnano)

v7.1.1: v71.1.1

Compare Source

Bug Fixes

• fix(convert-values): exclude linear() from stripping % from value 0 by @​cernymatej in #​1720

Full Changelog: https://github.com/cssnano/cssnano/compare/cssnano@7.1.0...cssnano@7.1.1

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