chore: downgrade fastify due to incompatibility

Author: openscript

apps/backend/package.json

@@ -43,7 +43,7 @@
     "class-transformer": "^0.5.1",
     "class-validator": "^0.14.1",
     "date-fns": "^4.1.0",
-    "fastify": "^4.29.0",
+    "fastify": "4.28.1",
     "hash-wasm": "^4.12.0",
     "reflect-metadata": "^0.2.2",
     "rxjs": "^7.8.1"