chore(deps): update dependency express to v4.21.0

Author: renovate[bot]

package.json

@@ -56,7 +56,7 @@
     "@types/readable-stream": "4.0.15",
     "benchmark": "2.1.4",
     "eslint": "9.6.0",
-    "express": "4.20.0",
+    "express": "4.21.0",
     "get-stream": "9.0.1",
     "http-proxy": "1.18.1",
     "is-stream": "4.0.1",