Update dependency express to v4.21.2

Author: renovate[bot]

alternatives/ssr-express-ejs/package.json

@@ -18,10 +18,10 @@
   "dependencies": {
     "dotenv-cli": "7.2.1",
     "ejs": "3.1.9",
-    "express": "4.18.2"
+    "express": "4.21.2"
   },
   "devDependencies": {
-    "@types/express": "4.17.17",
+    "@types/express": "4.17.21",
     "@types/node": "18.16.18",
     "@typescript-eslint/eslint-plugin": "5.60.0",
     "@typescript-eslint/parser": "5.60.0",

backend/package.json

@@ -7,6 +7,6 @@
   },
   "dependencies": {
     "dotenv-cli": "7.2.1",
-    "express": "4.18.2"
+    "express": "4.21.2"
   }
 }