[Snyk] Security upgrade cssnano from 4.1.0 to 5.0.0#2

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masterstartappdev/optimize-css-assets-webpack-plugin:masterfrom

snyk-fix-86ddde57a1e94bddbdcf3f05ea94d954startappdev/optimize-css-assets-webpack-plugin:snyk-fix-86ddde57a1e94bddbdcf3f05ea94d954Copy head branch name to clipboard