Upgrade cssnano to resolve dependency vulnerability

[rdotchin-rms]

To resolve inefficient regular expression complexity vulnerability in nth-check we need to upgrade cssnano to 5.0.5. nth-check requires version ^2.0.1 for the vulnerability fix.

optimize-css-assets-webpack-plugin > cssnano > cssnano-preset-default > postcss-svgo > svgo > renderkid > css-select > nth-check

[alexander-akait]

Please migrate on official plugin https://github.com/webpack-contrib/css-minimizer-webpack-plugin