chore(deps): update dependency cssnano to v5

This MR contains the following updates:

Package	Type	Update	Change
cssnano	devDependencies	major	4.1.11 -> 5.1.12

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Release Notes

cssnano/cssnano

v5.0.13

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v5.0.12

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v5.0.11

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v5.0.10

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v5.0.9

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v5.0.8

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v5.0.7

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v5.0.6

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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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Configuration

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