Update dependency @types/express to v4.17.15

Author: renovate[bot]

package-lock.json

@@ -11,7 +11,7 @@
     "@testing-library/dom": "8.19.0",
     "@testing-library/user-event": "13.5.0",
     "@types/eventsource": "1.1.10",
-    "@types/express": "4.17.14",
+    "@types/express": "4.17.15",
     "@types/mocha": "10.0.0",
     "@types/node": "18.7.14",
     "@types/node-fetch": "2.6.2",