[Snyk] Security upgrade cssnano from 4.1.0 to 5.0.0#3

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snyk-fix-11d2c6daf2001a5061e1a6203a4a60a8startappdev/optimize-css-assets-webpack-plugin:snyk-fix-11d2c6daf2001a5061e1a6203a4a60a8Copy head branch name to clipboard