Bump fastify from 5.1.0 to 5.3.1 in /example/fastify (#61)

Author: dependabot[bot]

example/fastify/package.json

@@ -10,7 +10,7 @@
   },
   "dependencies": {
     "@fastify/aws-lambda": "5.0.0",
-    "fastify": "5.1.0",
+    "fastify": "5.3.1",
     "i18next": "24.0.0",
     "i18next-fs-backend": "2.6.0",
     "i18next-http-middleware": "3.6.0",