Bump openai minimum version to >=2.21.0 to fix memory leak

Resolves a memory leak in structured outputs parse methods when using
Pydantic with runtime generics (openai/openai-python#2860).

https://claude.ai/code/session_01Pxc3jHuwJGHxkGehMgQGcP

Author: claude

packages/server/pyproject.toml

@@ -19,7 +19,7 @@ dependencies = [
     "langchain-aws>=0.2.33",
     "neo4j>=5.28.2",
     "nltk>=3.9.1",
-    "openai>=1.104.2",
+    "openai>=2.21.0",
     "pgvector>=0.4.1",
     "prometheus-client>=0.22.1",
     "pydantic>=2.11.7",

pyproject.toml

@@ -28,7 +28,7 @@ dependencies = [
     "langchain-aws>=0.2.33",
     "neo4j>=5.28.2",
     "nltk>=3.9.1",
-    "openai>=1.104.2",
+    "openai>=2.21.0",
     "pgvector>=0.4.1",
     "prometheus-client>=0.22.1",
     "pydantic>=2.11.7",