Update pyproject.toml

code/chapter14/helloagents-deepresearch/backend/pyproject.toml

@@ -10,7 +10,7 @@ license = { text = "MIT" }
 requires-python = ">=3.10"
 dependencies = [
     "fastapi>=0.115.0",
-    "hello-agents>=0.2.8",
+    "hello-agents==0.2.9",
     "tavily-python>=0.5.0",
     "python-dotenv==1.0.1",
     "requests>=2.31.0",