chore: Update constraints for API version 0.7.66 (#2974)

This PR updates the dependency constraints in the setup docs to match
`api/constraints.txt`. Merge when convenient.

**Changes detected as of API version 0.7.66**

This update was automatically generated by the sync workflow in the
langgraph-api repository.

Co-authored-by: jkennedyvz <65985482+jkennedyvz@users.noreply.github.com>

Author: hinthornw

src/langsmith/setup-app-requirements-txt.mdx

@@ -54,7 +54,7 @@ orjson>=3.9.7
 httpx>=0.25.0
 tenacity>=8.0.0
 uvicorn>=0.26.0
-sse-starlette>=2.1.0,<2.2.0
+sse-starlette>=3.0.0,<3.4.0
 uvloop>=0.18.0
 httptools>=0.5.0
 jsonschema-rs>=0.20.0

src/langsmith/setup-pyproject.mdx

@@ -53,7 +53,7 @@ orjson>=3.9.7
 httpx>=0.25.0
 tenacity>=8.0.0
 uvicorn>=0.26.0
-sse-starlette>=2.1.0,<2.2.0
+sse-starlette>=3.0.0,<3.4.0
 uvloop>=0.18.0
 httptools>=0.5.0
 jsonschema-rs>=0.20.0