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

Bumps [dompurify](https://github.com/cure53/DOMPurify) from 3.0.6 to 3.0.8.
- [Release notes](https://github.com/cure53/DOMPurify/releases)
- [Commits](cure53/DOMPurify@3.0.6...3.0.8)

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

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

showcase/playground-showcase/package.json

@@ -6,7 +6,7 @@
   "dependencies": {
     "@db-ui/react-elements": "file:./../../packages/db-ui-elements-react/",
     "ace-builds": "1.23.4",
-    "dompurify": "3.0.6",
+    "dompurify": "3.0.8",
     "grapesjs": "0.20.4",
     "grapesjs-preset-webpage": "1.0.3",
     "react": "17.0.2",