Bump langchain-core from 0.3.36 to 0.3.80 in /examples/integrations/langgraph (#128)

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

examples/integrations/langgraph/requirements.txt

@@ -2,7 +2,7 @@
 # Pinned versions for reproducible builds across Mac/Windows/Linux
 
 # Core LangChain and LangGraph - compatible versions
-langchain-core==0.3.36
+langchain-core==0.3.80
 langchain-ollama==0.2.2
 langgraph==0.2.60