ruff

7968e190 - Write unchanged, excluded files to stdout when read via stdin (#8596)

Write unchanged, excluded files to stdout when read via stdin (#8596) ## Summary When you run Ruff via stdin, and pass `format` or `check --fix`, we typically write the changed or unchanged contents to stdout. It turns out we forgot to do this when the file is _excluded_, so if you run `ruff format /path/to/excluded/file.py`, we don't write _anything_ to `stdout`. This led to a bug in the LSP whereby we deleted file contents for third-party files. The right thing to do here is write back the unchanged contents, as it should always be safe to write the output of stdout back to a file.