build(deps-dev): bump terser-webpack-plugin from 3.1.0 to 4.0.0 (#2387)

Bumps [terser-webpack-plugin](https://github.com/webpack-contrib/terser-webpack-plugin) from 3.1.0 to 4.0.0.
- [Release notes](https://github.com/webpack-contrib/terser-webpack-plugin/releases)
- [Changelog](https://github.com/webpack-contrib/terser-webpack-plugin/blob/master/CHANGELOG.md)
- [Commits](https://github.com/webpack-contrib/terser-webpack-plugin/compare/v3.1.0...v4.0.0)

Signed-off-by: dependabot[bot] <support@github.com>

package.json

@@ -74,7 +74,7 @@
     "style-loader": "^1.2.1",
     "stylelint": "^13.6.1",
     "stylelint-config-standard": "^20.0.0",
-    "terser-webpack-plugin": "^3.0.6",
+    "terser-webpack-plugin": "^4.0.0",
     "webpack": "^4.44.0",
     "webpack-bundle-analyzer": "^3.0.4",
     "webpack-cli": "^3.2.3",