RenovateBot: Update dependency cssnano to v5

This MR contains the following updates:

Package	Type	Update	Change
cssnano	dependencies	major	^4.1.10 -> ^5.0.0

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Release Notes

cssnano/cssnano

v5.0.5

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v5.0.4

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v5.0.3

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v5.0.2

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v5.0.1

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v5.0.0

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