build(deps): update dependency @fastify/multipart to v9.4.0

Author: renovate[bot]

package.json

@@ -28,7 +28,7 @@
     "@fastify/cors": "11.0.1",
     "@fastify/helmet": "13.0.1",
     "@fastify/jwt": "9.1.0",
-    "@fastify/multipart": "9.0.3",
+    "@fastify/multipart": "9.4.0",
     "@fastify/static": "8.2.0",
     "jsonwebtoken": "9.0.2",
     "lodash": "4.17.21",