Bump terser-webpack-plugin from 3.0.3 to 3.0.4

Bumps [terser-webpack-plugin](https://github.com/webpack-contrib/terser-webpack-plugin) from 3.0.3 to 3.0.4.
- [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/v3.0.3...v3.0.4)

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

package.json

@@ -45,7 +45,7 @@
         "prettier": "^2.0.5",
         "reflect-metadata": "^0.1.13",
         "replace-in-file-webpack-plugin": "^1.0.6",
-        "terser-webpack-plugin": "^3.0.3",
+        "terser-webpack-plugin": "^3.0.4",
         "tfx-cli": "^0.8.1",
         "ts-loader": "^7.0.5",
         "typescript": "^3.9.5",