Bump terser-webpack-plugin from 4.1.0 to 4.2.0

Bumps [terser-webpack-plugin](https://github.com/webpack-contrib/terser-webpack-plugin) from 4.1.0 to 4.2.0.
- [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/v4.1.0...v4.2.0)

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

package.json

@@ -45,7 +45,7 @@
         "prettier": "^2.1.1",
         "reflect-metadata": "^0.1.13",
         "replace-in-file-webpack-plugin": "^1.0.6",
-        "terser-webpack-plugin": "^4.1.0",
+        "terser-webpack-plugin": "^4.2.0",
         "tfx-cli": "^0.8.2",
         "ts-loader": "^8.0.3",
         "typescript": "^4.0.2",