Bump uglify-js from 3.16.1 to 3.17.4

Bumps [uglify-js](https://github.com/mishoo/UglifyJS) from 3.16.1 to 3.17.4.
- [Release notes](https://github.com/mishoo/UglifyJS/releases)
- [Commits](mishoo/UglifyJS@v3.16.1...v3.17.4)

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

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

package-lock.json

@@ -23,7 +23,7 @@
   "devDependencies": {
     "npm-run-all": "^4.1.5",
     "onchange": "^7.1.0",
-    "uglify-js": "^3.16.1"
+    "uglify-js": "^3.17.4"
   },
   "scripts": {
     "uglify": "uglifyjs assets/js/vendor/jquery/jquery-3.4.1.js assets/js/plugins/jquery.fitvids.js assets/js/plugins/jquery.greedy-navigation.js assets/js/plugins/jquery.magnific-popup.js assets/js/plugins/jquery.ba-throttle-debounce.js assets/js/plugins/smooth-scroll.js assets/js/plugins/gumshoe.js assets/js/_main.js -c -m -o assets/js/main.min.js",