Bump terser from 5.8.0 to 5.9.0

Bumps [terser](https://github.com/terser/terser) from 5.8.0 to 5.9.0.
- [Release notes](https://github.com/terser/terser/releases)
- [Changelog](https://github.com/terser/terser/blob/master/CHANGELOG.md)
- [Commits](https://github.com/terser/terser/compare/v5.8.0...v5.9.0)

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

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

package.json

@@ -5,6 +5,6 @@
     "html-minifier": "^4.0.0",
     "stylelint": "^13.13.1",
     "stylelint-config-standard": "^22.0.0",
-    "terser": "^5.8.0"
+    "terser": "^5.9.0"
   }
 }