fix: packages/app-desktop/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

packages/app-desktop/package.json

@@ -197,6 +197,6 @@
     "styled-components": "5.3.11",
     "styled-system": "5.1.5",
     "taboverride": "4.0.3",
-    "tinymce": "6.8.2"
+    "tinymce": "7.0.0"
   }
 }