build(deps): bump dompurify in /showcase/playground-showcase

Bumps [dompurify](https://github.com/cure53/DOMPurify) from 3.2.6 to 3.4.12.
- [Release notes](https://github.com/cure53/DOMPurify/releases)
- [Commits](cure53/DOMPurify@3.2.6...3.4.12)

---
updated-dependencies:
- dependency-name: dompurify
  dependency-version: 3.4.12
  dependency-type: direct:production
...

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

Author: dependabot[bot]

showcase/playground-showcase/package.json

@@ -6,7 +6,7 @@
   "type": "module",
   "dependencies": {
     "ace-builds": "1.36.5",
-    "dompurify": "3.2.6",
+    "dompurify": "3.4.12",
     "grapesjs": "0.21.12",
     "grapesjs-preset-webpage": "1.0.3",
     "react": "18.3.1",