chore(deps-dev): bump langchain from 1.2.13 to 1.3.9

Bumps [langchain](https://github.com/langchain-ai/langchain) from 1.2.13 to 1.3.9.
- [Release notes](https://github.com/langchain-ai/langchain/releases)
- [Commits](langchain-ai/langchain@langchain==1.2.13...langchain==1.3.9)

---
updated-dependencies:
- dependency-name: langchain
  dependency-version: 1.3.9
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

pyproject.toml

@@ -30,7 +30,7 @@ dev = [
     "mypy>=1.0.0,<2",
     "openai>=0.27.8",
     "langchain-openai>=0.0.5,<0.4",
-    "langchain>=1,<2",
+    "langchain>=1.3.9,<2",
     "langgraph>=1,<2",
     "autoevals>=0.0.130,<0.1",
     "opentelemetry-instrumentation-threading>=0.59b0,<1",