build(deps): bump @fastify/static from 8.3.0 to 9.0.0 in /backend (#187)

Bumps [@fastify/static](https://github.com/fastify/fastify-static) from 8.3.0 to 9.0.0.
- [Release notes](https://github.com/fastify/fastify-static/releases)
- [Commits](https://github.com/fastify/fastify-static/compare/v8.3.0...v9.0.0)

---
updated-dependencies:
- dependency-name: "@fastify/static"
  dependency-version: 9.0.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

backend/package.json

@@ -24,7 +24,7 @@
     "@fastify/multipart": "^9.4.0",
     "@fastify/rate-limit": "^10.3.0",
     "@fastify/sensible": "^6.0.4",
-    "@fastify/static": "^8.3.0",
+    "@fastify/static": "^9.0.0",
     "@libsql/client": "^0.17.0",
     "argon2": "^0.44.0",
     "dotenv": "^16.4.5",