chore(langchain_v1): remove text splitters from langchain v1 namespace (#33297)

Removing text splitters for now for a lighter dependency. We may re-introduce

Author: eyurtsev

libs/langchain_v1/langchain/text_splitter.py

@@ -8,7 +8,6 @@ license = { text = "MIT" }
 requires-python = ">=3.10.0,<4.0.0"
 dependencies = [
     "langchain-core>=1.0.0a6,<2.0.0",
-    "langchain-text-splitters>=1.0.0a1,<2.0.0",
     "langgraph>=1.0.0a4,<2.0.0",
     "pydantic>=2.7.4,<3.0.0",
 ]

libs/langchain_v1/pyproject.toml

@@ -30,6 +30,4 @@ def test_required_dependencies(uv_conf: Mapping[str, Any]) -> None:
     dependencies = uv_conf["project"]["dependencies"]
     required_dependencies = {Requirement(dep).name for dep in dependencies}
 
-    assert sorted(required_dependencies) == sorted(
-        ["langchain-core", "langchain-text-splitters", "langgraph", "pydantic"]
-    )
+    assert sorted(required_dependencies) == sorted(["langchain-core", "langgraph", "pydantic"])