chore(deps): bump fastify from 5.6.2 to 5.7.3

Bumps [fastify](https://github.com/fastify/fastify) from 5.6.2 to 5.7.3.
- [Release notes](https://github.com/fastify/fastify/releases)
- [Commits](fastify/fastify@v5.6.2...v5.7.3)

---
updated-dependencies:
- dependency-name: fastify
  dependency-version: 5.7.3
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

package.json

@@ -101,7 +101,7 @@
     "emoji-regex": "^10.6.0",
     "eventsource": "^2.0.2",
     "fast-json-stringify": "^6.1.1",
-    "fastify": "^5.6.2",
+    "fastify": "^5.7.3",
     "fastify-plugin": "^5.1.0",
     "fastify-raw-body": "^5.0.0",
     "fastq": "^1.20.1",