Update dependency ceiling for OpenAI agents (#1256)

Author: tconley1428

pyproject.toml

@@ -28,7 +28,7 @@ classifiers = [
 grpc = ["grpcio>=1.48.2,<2"]
 opentelemetry = ["opentelemetry-api>=1.11.1,<2", "opentelemetry-sdk>=1.11.1,<2"]
 pydantic = ["pydantic>=2.0.0,<3"]
-openai-agents = ["openai-agents>=0.3,<0.5", "mcp>=1.9.4, <2"]
+openai-agents = ["openai-agents>=0.3,<0.7", "mcp>=1.9.4, <2"]
 
 [project.urls]
 Homepage = "https://github.com/temporalio/sdk-python"
@@ -56,8 +56,8 @@ dev = [
   "pytest-cov>=6.1.1",
   "httpx>=0.28.1",
   "pytest-pretty>=1.3.0",
-  "openai-agents>=0.3,<0.5; python_version >= '3.14'",
-  "openai-agents[litellm]>=0.3,<0.4; python_version < '3.14'",
+  "openai-agents>=0.3,<0.7; python_version >= '3.14'",
+  "openai-agents[litellm]>=0.3,<0.7; python_version < '3.14'",
   "googleapis-common-protos==1.70.0",
   "pytest-rerunfailures>=16.1",
 ]