Bump fastify from 5.3.2 to 5.7.3

Bumps [fastify](https://github.com/fastify/fastify) from 5.3.2 to 5.7.3.
- [Release notes](https://github.com/fastify/fastify/releases)
- [Commits](fastify/fastify@v5.3.2...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-lock.json

@@ -29,7 +29,7 @@
     "dedent": "1.5.3",
     "discord.js": "14.21.0",
     "dotenv": "16.4.5",
-    "fastify": "^5.3.2",
+    "fastify": "^5.7.3",
     "gists": "2.0.0",
     "lru-cache": "10.2.2",
     "marked": "^15.0.6",