fix: samples/server/petstore/nodejs-express-server/package.json to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-DICER-2311764
- https://snyk.io/vuln/SNYK-JS-MULTER-10185673
- https://snyk.io/vuln/SNYK-JS-MULTER-10185675

Author: snyk-bot

samples/server/petstore/nodejs-express-server/package.json

@@ -19,7 +19,7 @@
     "cookie-parser": "^1.4.4",
     "cors": "^2.8.5",
     "express": "^4.16.4",
-    "express-openapi-validator": "^3.9.1",
+    "express-openapi-validator": "^5.5.3",
     "js-yaml": "^3.3.0",
     "ono": "^5.0.1",
     "openapi-sampler": "^1.0.0-beta.15",