Bump dompurify and @types/dompurify in /app/frontend

Bumps [dompurify](https://github.com/cure53/DOMPurify) and [@types/dompurify](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/dompurify). These dependencies needed to be updated together.

Updates `dompurify` from 3.0.6 to 3.1.6
- [Release notes](https://github.com/cure53/DOMPurify/releases)
- [Commits](cure53/DOMPurify@3.0.6...3.1.6)

Updates `@types/dompurify` from 3.0.4 to 3.0.5
- [Release notes](https://github.com/DefinitelyTyped/DefinitelyTyped/releases)
- [Commits](https://github.com/DefinitelyTyped/DefinitelyTyped/commits/HEAD/types/dompurify)

---
updated-dependencies:
- dependency-name: dompurify
  dependency-type: direct:production
  update-type: version-update:semver-minor
- dependency-name: "@types/dompurify"
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

app/frontend/package.json

@@ -18,7 +18,7 @@
     "@fluentui/react-components": "^9.54.13",
     "@fluentui/react-icons": "^2.0.249",
     "@react-spring/web": "^9.7.3",
-    "dompurify": "^3.0.6",
+    "dompurify": "^3.1.6",
     "i18next": "^23.12.2",
     "i18next-browser-languagedetector": "^8.0.0",
     "i18next-http-backend": "^2.5.2",
@@ -36,7 +36,7 @@
   },
   "devDependencies": {
     "@types/dom-speech-recognition": "^0.0.4",
-    "@types/dompurify": "^3.0.4",
+    "@types/dompurify": "^3.0.5",
     "@types/react": "^18.3.3",
     "@types/react-dom": "^18.3.0",
     "@types/react-syntax-highlighter": "^15.5.13",