fix: packages/app-desktop/package.json to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-ELLIPTIC-8172694
- https://snyk.io/vuln/SNYK-JS-COOKIE-8163060

packages/app-desktop/package.json

@@ -153,7 +153,7 @@
     "@types/mustache": "4.2.5",
     "@types/node-rsa": "1.1.4",
     "@types/styled-system": "^5.1.22",
-    "@xilinota/lib": "^2.15.0",
+    "@xilinota/lib": "^2.13.0",
     "@xilinota/utils": "^2.13.1",
     "async-mutex": "0.4.1",
     "codemirror": "5.65.16",
@@ -165,7 +165,7 @@
     "electron-progressbar": "2.1.0",
     "electron-unhandled": "^4.0.1",
     "electron-window-state": "5.0.3",
-    "express": "4.18.2",
+    "express": "4.21.1",
     "formatcoords": "1.1.3",
     "fs-extra": "11.2.0",
     "highlight.js": "11.9.0",