Update dependency express to v4.21.0

Author: renovate[bot]

package.json

@@ -29,7 +29,7 @@
 		"eslint-config-prettier": "8.6.0",
 		"eslint-plugin-prettier": "4.0.0",
 		"ethers": "5.6.2",
-		"express": "4.17.3",
+		"express": "4.21.0",
 		"graphql-ws": "5.7.0",
 		"jsonwebtoken": "8.5.1",
 		"octokit": "1.7.1",