fix: package.json to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-SEND-7926862

package.json

@@ -132,7 +132,7 @@
     "drizzle-zod": "0.5.1",
     "ejs": "3.1.10",
     "eslint-config-airbnb": "19.0.4",
-    "express": "4.20.0",
+    "express": "4.21.0",
     "express-mongo-sanitize": "2.2.0",
     "express-session": "1.18.0",
     "express-status-monitor": "1.3.4",