fix: app/client/package.json to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-TINYMCE-6501006
- https://snyk.io/vuln/SNYK-JS-TINYMCE-6501605

app/client/package.json

@@ -53,7 +53,7 @@
     "@sentry/react": "^6.2.4",
     "@sentry/tracing": "^6.2.4",
     "@tanstack/virtual-core": "^3.0.0-beta.18",
-    "@tinymce/tinymce-react": "^3.13.0",
+    "@tinymce/tinymce-react": "^5.0.0",
     "@types/google.maps": "^3.51.0",
     "@types/react-page-visibility": "^6.4.1",
     "@uppy/core": "^1.16.0",