Files
langgraph/libs/cli/langgraph_cli
raghavverma-langchain 58be6911de release(cli): 0.4.40 (#9443)
## Summary

bumps the cli to 0.4.40 to cut a release with #9396, the only cli change
since 0.4.39

- `langgraph deploy --remote` now sends whatever headers the control
plane returns with the source upload url, so uploads work with storage
that needs extra headers (like azure blob storage)
- control planes that dont return any headers keep the old behavior, so
nothing changes for existing setups

## Test Plan
- [x] #9396 (send the upload headers the control plane returns) is the
only CLI change merged since 0.4.39
- [ ] After merge, run the `release` workflow with `working-directory:
libs/cli` (merging doesn't publish by itself)
- [ ] `pip install -U langgraph-cli` picks up 0.4.40

## Demo

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