Bump uglifyjs-webpack-plugin from 2.0.1 to 2.1.0 in /js

Bumps [uglifyjs-webpack-plugin](https://github.com/webpack-contrib/uglifyjs-webpack-plugin) from 2.0.1 to 2.1.0.
- [Release notes](https://github.com/webpack-contrib/uglifyjs-webpack-plugin/releases)
- [Changelog](https://github.com/webpack-contrib/uglifyjs-webpack-plugin/blob/master/CHANGELOG.md)
- [Commits](https://github.com/webpack-contrib/uglifyjs-webpack-plugin/compare/v2.0.1...v2.1.0)

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

js/package-lock.json

@@ -6333,9 +6333,9 @@
       }
     },
     "uglifyjs-webpack-plugin": {
-      "version": "2.0.1",
-      "resolved": "https://registry.npmjs.org/uglifyjs-webpack-plugin/-/uglifyjs-webpack-plugin-2.0.1.tgz",
-      "integrity": "sha512-1HhCHkOB6wRCcv7htcz1QRPVbWPEY074RP9vzt/X0LF4xXm9l4YGd0qja7z88abDixQlnVwBjXsTBs+Xsn/eeQ==",
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/uglifyjs-webpack-plugin/-/uglifyjs-webpack-plugin-2.1.0.tgz",
+      "integrity": "sha512-xD8HaE8sFvhYsE2Lr4lSQ/Y2K0DBEaZGqIsrIccdxaAWdFdeYcm54CcMoCCPDpixqUlZAukUMq3cmgIqXubjsQ==",
       "dev": true,
       "requires": {
         "cacache": "^11.2.0",

js/package.json

@@ -29,7 +29,7 @@
     "css-loader": "^2.0.2",
     "karma": "^3.1.3",
     "mini-css-extract-plugin": "^0.5.0",
-    "uglifyjs-webpack-plugin": "^2.0.1",
+    "uglifyjs-webpack-plugin": "^2.1.0",
     "webpack": "^4.27.1",
     "webpack-cli": "^3.1.2",
     "webpack-merge": "^4.1.5"