release(langchain): 1.4.1 (#40498)

Bumps the `langchain` package from 1.4.0 to 1.4.1 so the fixes merged
since the previous release can be published, including support for open
MCP object arguments.

Updates the package version, importable `__version__`, and lockfile
package entry. `uv lock` resolved successfully; its unrelated workspace
dependency churn was intentionally excluded.

Made by [Open
SWE](https://openswe.vercel.app/agents/3165441c-7638-5635-ae33-7d39299acb38)
· openai:gpt-5.6-sol (medium)

Co-authored-by: John Kennedy <65985482+jkennedyvz@users.noreply.github.com>
Co-authored-by: open-swe[bot] <open-swe@users.noreply.github.com>

libs/langchain_v1/langchain/__init__.py

@@ -1,3 +1,3 @@
 """Main entrypoint into LangChain."""
 
-__version__ = "1.4.0"
+__version__ = "1.4.1"

libs/langchain_v1/pyproject.toml

@@ -21,7 +21,7 @@ classifiers = [
     "Topic :: Software Development :: Libraries :: Python Modules",
 ]
 
-version = "1.4.0"
+version = "1.4.1"
 requires-python = ">=3.10.0,<4.0.0"
 dependencies = [
     "langchain-core>=1.6.0,<2.0.0",

libs/langchain_v1/uv.lock

@@ -2283,7 +2283,7 @@ wheels = [
 
 [[package]]
 name = "langchain"
-version = "1.4.0"
+version = "1.4.1"
 source = { editable = "." }
 dependencies = [
     { name = "langchain-core" },