Bump langchain

Bumps the uv group with 1 update in the /python/examples/adapter_langchain directory: [langchain](https://github.com/langchain-ai/langchain).


Updates `langchain` from 0.3.21 to 1.3.9
- [Release notes](https://github.com/langchain-ai/langchain/releases)
- [Commits](langchain-ai/langchain@langchain==0.3.21...langchain==1.3.9)

---
updated-dependencies:
- dependency-name: langchain
  dependency-version: 1.3.9
  dependency-type: direct:production
  dependency-group: uv
...

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

Author: dependabot[bot]

python/examples/adapter_langchain/pyproject.toml

@@ -6,7 +6,7 @@ authors = [{ name = "thirdweb", email = "support@thirdweb.com" }]
 requires-python = "~=3.10"
 dependencies = [
     "thirdweb-ai[langchain]",
-    "langchain>=0.3.0,<0.4",
+    "langchain>=1.3.9,<1.4",
     "langchain-openai>=0.3.0,<0.4",
 ]