Bump terser-webpack-plugin from 5.3.8 to 5.3.9

Bumps [terser-webpack-plugin](https://github.com/webpack-contrib/terser-webpack-plugin) from 5.3.8 to 5.3.9.
- [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/v5.3.8...v5.3.9)

---
updated-dependencies:
- dependency-name: terser-webpack-plugin
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

package.json

@@ -43,7 +43,7 @@
     "sortablejs": "^1.15.0",
     "sorttable": "^1.0.2",
     "style-loader": "^3.3.2",
-    "terser-webpack-plugin": "^5.3.8",
+    "terser-webpack-plugin": "^5.3.9",
     "underscore": "^1.13.4",
     "uuid": "^9.0.0",
     "vis-data": "^7.1.6",