Update dependency css-minimizer-webpack-plugin to v8

Author: renovate[bot]

package.json

@@ -50,7 +50,7 @@
     "copy-webpack-plugin": "^12.0.2",
     "cross-env": "^7.0.3",
     "css-loader": "5.2.7",
-    "css-minimizer-webpack-plugin": "^7.0.0",
+    "css-minimizer-webpack-plugin": "^8.0.0",
     "eslint": "^8.56.0",
     "eslint-config-airbnb-base": "^15.0.0",
     "eslint-plugin-import": "^2.29.1",