Bump terser from 4.3.9 to 4.4.0 (twbs#29660)

Bumps [terser](https://github.com/terser/terser) from 4.3.9 to 4.4.0.
- [Release notes](https://github.com/terser/terser/releases)
- [Changelog](https://github.com/terser/terser/blob/master/CHANGELOG.md)
- [Commits](terser/terser@v4.3.9...v4.4.0)

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

package.json

@@ -132,7 +132,7 @@
     "shelljs": "^0.8.3",
     "stylelint": "^11.1.1",
     "stylelint-config-twbs-bootstrap": "^0.9.0",
-    "terser": "^4.3.9",
+    "terser": "^4.4.0",
     "vnu-jar": "19.9.4"
   },
   "engines": {