chore: Bump terser-webpack-plugin from 2.0.1 to 2.2.1

Bumps [terser-webpack-plugin](https://github.com/webpack-contrib/terser-webpack-plugin) from 2.0.1 to 2.2.1.
- [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](webpack-contrib/terser-webpack-plugin@v2.0.1...v2.2.1)

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

package.json

@@ -141,7 +141,7 @@
     "standard-version": "^4.4.0",
     "style-loader": "1.0.0",
     "stylelint": "^10.1.0",
-    "terser-webpack-plugin": "2.0.1",
+    "terser-webpack-plugin": "2.2.1",
     "tocbot": "^4.5.0",
     "url-loader": "2.1.0",
     "webpack": "4.40.2",