Update dependency versions in `pyproject.toml` for `langchain-cerebras`, `langchain-community`, and `langchain-core` to ensure compatibility and introduce a new `langgraph` version constraint.

pyproject.toml

@@ -23,15 +23,16 @@ dependencies = [
     "httpx-sse==0.4.1",
     "langchain>=0.3.20,<0.4.0",
     "langchain-agentql>=1.0.0",
-    "langchain-cerebras>=0.8.1",
-    "langchain-community>=0.3.0,<0.4.0",
-    "langchain-core>=0.3.15,<0.4.0",
+    "langchain-cerebras>=0.8.1,<0.8.2",
+    "langchain-community>=0.3.17,<0.4.0",
+    "langchain-core>=0.3.29,<0.4.0",
     "langchain-ollama>=0.3.0,<0.4.0",
     "langchain-openai>=0.3.4,<0.4.0",
+    "langgraph-prebuilt",
     "langchain-tavily>=0.1.5,<0.2.0",
     "langchain-text-splitters>=0.3.0,<0.4.0",
     "langfuse==3.6.1",
-    "langgraph",
+    "langgraph>=0.6.0,<1.0.0",
     "langgraph-checkpoint-mongodb>=0.2.2",
     "langgraph-runtime-inmem>=0.20.0,<0.21.0",
     "langgraph-sdk",