fix: src/code-templates/services/order-service/package.json to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-FASTIFY-15182642
- https://snyk.io/vuln/SNYK-JS-FASTIFY-15182641

Author: snyk-bot

src/code-templates/services/order-service/package.json

@@ -39,7 +39,7 @@
     "axios": "^0.26.1",
     "sequelize": "^6.17.0",
     "express": "^4.17.3",
-    "fastify": "^4.24.3",
+    "fastify": "^5.7.3",
     "helmet": "^6.0.0",
     "node-notifier": "^10.0.1",
     "pg": "^8.7.3"