fix: package.json to reduce vulnerabilities

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

Author: snyk-bot

package.json

@@ -29,7 +29,7 @@
     "@angular/ssr": "18.0.5",
     "@ngx-builders/analyze": "4.0.0",
     "@nx/angular": "19.3.1",
-    "express": "~4.18.2",
+    "express": "~4.21.1",
     "hammerjs": "2.0.8",
     "rxjs": "7.8.1",
     "tslib": "2.6.2",