Update LibCST (#7062)
## Summary
This PR updates the revision of `LibCST` dependency to https://github.com/Instagram/LibCST/commit/9c263aa8977962a870ce2770d2aa18ee0dacb344
inorder to fix https://github.com/astral-sh/ruff/issues/4899
## Test Plan
The test case including the carriage return (`\r`) character was added for
`F504` and then `cargo test`.
fixes: #4899
