chore(deps): bump langchain-core in the pip group across 1 directory

Bumps the pip group with 1 update in the / directory: [langchain-core](https://github.com/langchain-ai/langchain).


Updates `langchain-core` from 0.3.80 to 0.3.81
- [Release notes](https://github.com/langchain-ai/langchain/releases)
- [Commits](langchain-ai/langchain@langchain-core==0.3.80...langchain-core==0.3.81)

---
updated-dependencies:
- dependency-name: langchain-core
  dependency-version: 0.3.81
  dependency-type: direct:production
  dependency-group: pip
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

pyproject.toml

@@ -28,7 +28,7 @@ dependencies = [
     "langchain-mcp-adapters==0.1.13",
     "langchain-huggingface==0.3.1",
     "langchain-ollama==0.3.10",
-    "langchain_core==0.3.80",
+    "langchain_core==0.3.81",
     "langchain-aws==0.2.28",
     "langgraph==0.5.3",
     "torch==2.8.0",