chore(deps): bump fastify from 5.2.1 to 5.3.1 in /examples

Bumps [fastify](https://github.com/fastify/fastify) from 5.2.1 to 5.3.1.
- [Release notes](https://github.com/fastify/fastify/releases)
- [Commits](fastify/fastify@v5.2.1...v5.3.1)

---
updated-dependencies:
- dependency-name: fastify
  dependency-version: 5.3.1
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

examples/package.json

@@ -3,7 +3,7 @@
     "@bufbuild/protobuf": "^2.2.4",
     "@connectrpc/connect-node": "2.0.2",
     "@connectrpc/connect-fastify": "~2.0.2",
-    "fastify": "~5.2.1"
+    "fastify": "~5.3.1"
   },
   "devDependencies": {
     "@bufbuild/protoc-gen-es": "~2.2.4",