build(deps): bump the python-deps group across 3 directories with 6 updates

cmd/chaos-agent/requirements.txt

@@ -1,9 +1,9 @@
-openai>=3.18.0,<4
+openai>=3.20.0,<4
 # Pinned to a major version: 1.x spells the transport streamablehttp_client and
 # 2.x spells it streamable_http_client, so an unpinned floor silently changes
 # the API underneath a sandbox image.
 mcp>=2.2.0,<3
 # LangChain 1.x replaced AgentExecutor with create_agent, which is what the
 # agent is written against; 0.x no longer receives security fixes.
-langchain>=1.4.2,<2
-langchain-openai>=1.6.3,<2
+langchain>=1.4.3,<2
+langchain-openai>=1.6.6,<2

development/examples/chat-a2a/requirements.txt

@@ -1,6 +1,6 @@
 a2a-sdk>=1.1.5
 google-genai>=2.25.0
 httpx>=0.28.1
-sse-starlette>=3.4.11
-starlette>=1.6.0
-uvicorn>=0.53.0
+sse-starlette>=3.5.0
+starlette>=1.7.0
+uvicorn>=0.54.0

tests/e2e/docker/a2a-echo/requirements.txt

@@ -1,5 +1,5 @@
 a2a-sdk>=1.1.5
 httpx>=0.28.1
-sse-starlette>=3.4.11
-starlette>=1.6.0
-uvicorn>=0.53.0
+sse-starlette>=3.5.0
+starlette>=1.7.0
+uvicorn>=0.54.0