constrain jinja2 dependency to <4

Author: jiwon-oai

pyproject.toml

@@ -4,7 +4,7 @@ version = "1.4.0"
 description = "A ChatKit backend SDK."
 readme = "README.md"
 requires-python = ">=3.10"
-dependencies = ["pydantic", "uvicorn", "openai", "openai-agents>=0.3.2", "jinja2"]
+dependencies = ["pydantic", "uvicorn", "openai", "openai-agents>=0.3.2", "jinja2>=3.1,<4"]
 
 [dependency-groups]
 dev = [