RenovateBot: Update dependency cssnano to v7.0.4

This MR contains the following updates:

Package	Type	Update	Change
cssnano	dependencies	patch	7.0.3 -> 7.0.4

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Release Notes

cssnano/cssnano (cssnano)

v7.0.4: v7.0.4

Compare Source

Bug fixes

• fix(postcss-convert-values): preserve percent sign in border-image-width in https://github.com/cssnano/cssnano/pull/1645

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Configuration

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