Bump terser from 4.6.4 to 4.6.6 (#30350)

Bumps [terser](https://github.com/terser/terser) from 4.6.4 to 4.6.6.
- [Release notes](https://github.com/terser/terser/releases)
- [Changelog](https://github.com/terser/terser/blob/master/CHANGELOG.md)
- [Commits](terser/terser@v4.6.4...v4.6.6)

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

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>
Co-authored-by: XhmikosR <xhmikosr@gmail.com>

package.json

@@ -133,7 +133,7 @@
     "shelljs": "^0.8.3",
     "stylelint": "^13.2.0",
     "stylelint-config-twbs-bootstrap": "^2.0.1",
-    "terser": "^4.6.4",
+    "terser": "^4.6.6",
     "vnu-jar": "20.2.28"
   },
   "files": [