Bump langgraph from 0.3.27 to 0.3.34 (#412)

Bumps [langgraph](https://github.com/langchain-ai/langgraph) from 0.3.27 to 0.3.34.
- [Release notes](https://github.com/langchain-ai/langgraph/releases)
- [Commits](https://github.com/langchain-ai/langgraph/compare/0.3.27...0.3.34)

---
updated-dependencies:
- dependency-name: langgraph
  dependency-version: 0.3.34
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

poetry.lock

@@ -1820,20 +1820,20 @@ tiktoken = ">=0.7,<1"
 
 [[package]]
 name = "langgraph"
-version = "0.3.27"
+version = "0.3.34"
 description = "Building stateful, multi-actor applications with LLMs"
 optional = false
 python-versions = "<4.0,>=3.9.0"
 groups = ["dev"]
 files = [
-    {file = "langgraph-0.3.27-py3-none-any.whl", hash = "sha256:7d866fcd4cb0bc4931b5d5ec622c8bda9b88c41e37c79fd9ef1007460fb448a1"},
-    {file = "langgraph-0.3.27.tar.gz", hash = "sha256:bd731f9e56b82d069b20b360107f8cfc7e80f3035d33fcfb833cf80bcb2a270d"},
+    {file = "langgraph-0.3.34-py3-none-any.whl", hash = "sha256:4bf8af313ce7686e8a7597ca5441341ec89f9a9fe73ba1b07c116755efa3117d"},
+    {file = "langgraph-0.3.34.tar.gz", hash = "sha256:d4107b2101ee4a6f93f33b0fac1064d46ac3491f783200affac29f229ab0b93c"},
 ]
 
 [package.dependencies]
 langchain-core = ">=0.1,<0.4"
 langgraph-checkpoint = ">=2.0.10,<3.0.0"
-langgraph-prebuilt = ">=0.1.1,<0.2"
+langgraph-prebuilt = ">=0.1.8,<0.2"
 langgraph-sdk = ">=0.1.42,<0.2.0"
 xxhash = ">=3.5.0,<4.0.0"