Bump uglify-js in /themes/common-theme/webapp/common-theme/js (#814)

Bumps [uglify-js](https://github.com/mishoo/UglifyJS) from 3.17.4 to 3.18.0.
- [Release notes](https://github.com/mishoo/UglifyJS/releases)
- [Commits](mishoo/UglifyJS@v3.17.4...v3.18.0)

---
updated-dependencies:
- dependency-name: uglify-js
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

themes/common-theme/webapp/common-theme/js/package.json

@@ -15,7 +15,7 @@
         "jquery-validation": "^1.20.0",
         "jquery.browser": "^0.1.0",
         "trumbowyg": "^2.28.0",
-        "uglify-js": "3.17.4"
+        "uglify-js": "3.18.0"
     },
     "scripts": {
         "uglify": "uglifyjs node_modules/flot/dist/es5/jquery.flot.js -c -m -o node_modules/flot/dist/es5/jquery.flot.min.js"