Update dependency express to v4.21.2

Author: renovate[bot]

package.json

@@ -105,7 +105,7 @@
     "eslint-plugin-react": "7.37.5",
     "eslint-plugin-react-hooks": "5.2.0",
     "eslint-plugin-testing-library": "7.13.2",
-    "express": "4.20.0",
+    "express": "4.21.2",
     "globals": "^16.1.0",
     "jsdom": "24.1.3",
     "jsonwebtoken": "9.0.0",