chore(deps): Update python samples' optional deps (#191)

* chore(deps): Update python samples' optional deps

In future versions of a2a-sdk, HTTP server packages may become optional.
See a2aproject/a2a-python/pull/217 for details. This PR ensures that
agents in `samples/python/agents/` continue to work with the future
versions on a2a-sdk.

Refs #190

* Add langchain-openai dep to the langgraph sample

This issue was noted by the automated code review bot.

Author: darkhaniop

samples/python/agents/analytics/pyproject.toml

@@ -9,4 +9,6 @@ dependencies = [
     "matplotlib>=3.8.0",
     "pandas>=2.1.0",
     "a2a-sdk>=0.2.5",
+    "sse-starlette>=2.3.6",
+    "starlette>=0.46.2",
 ]

samples/python/agents/analytics/uv.lock

@@ -14,4 +14,5 @@ dependencies = [
     "python-dotenv>=1.0.0",
     "starlette>=0.35.0",
     "httpx>=0.25.0",
+    "sse-starlette>=2.3.5",
 ]

samples/python/agents/azureaifoundry_sdk/azurefoundryagent/pyproject.toml

@@ -5,7 +5,16 @@ description = "HelloWorld agent example that only returns Messages"
 readme = "README.md"
 requires-python = ">=3.10"
 dependencies = [
-    "a2a-sdk>=0.2.16",
+    "a2a-sdk>=0.2.16",    
+    "click>=8.1.8",
+    "dotenv>=0.9.9",
+    "httpx>=0.28.1",
+    "langchain-google-genai>=2.1.4",
+    "langgraph>=0.4.1",
+    "pydantic>=2.11.4",
+    "python-dotenv>=1.1.0",
+    "sse-starlette>=2.3.5",
+    "starlette>=0.46.2",
     "uvicorn>=0.34.2",
 ]
 

samples/python/agents/azureaifoundry_sdk/azurefoundryagent/uv.lock

@@ -10,10 +10,12 @@ dependencies = [
     "httpx>=0.28.1",
     "langchain-google-genai>=2.0.10",
     "langgraph>=0.3.18",
-    "langchain-openai >=0.1.0",
+    "langchain-openai>=0.1.0",
     "pydantic>=2.10.6",
     "python-dotenv>=1.1.0",
     "uvicorn>=0.34.2",
+    "sse-starlette>=2.3.6",
+    "starlette>=0.46.2",
 ]
 
 [tool.hatch.build.targets.wheel]