Bump dompurify from 2.4.4 to 3.0.6

Bumps [dompurify](https://github.com/cure53/DOMPurify) from 2.4.4 to 3.0.6.
- [Release notes](https://github.com/cure53/DOMPurify/releases)
- [Commits](cure53/DOMPurify@2.4.4...3.0.6)

---
updated-dependencies:
- dependency-name: dompurify
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

package.json

@@ -91,7 +91,7 @@
     "@wordpress/warning": "^2.22.0",
     "@wordpress/widgets": "^2.20.0",
     "@wordpress/wordcount": "^3.22.0",
-    "dompurify": "^2.4.3",
+    "dompurify": "^3.0.6",
     "prop-types": "^15.8.1",
     "react": "17.0.2",
     "react-dom": "17.0.2"