…nments (#16824)

## Summary

Closes #16818.

## Summary

Fix ``uv pip install -r /dev/stdin`` which was broken in uv 0.9.12 by
#16805 .

Example of the issue:

```
$ echo "flask" | uv pip install -r /dev/stdin
warning: Requirements file `/dev/stdin` does not contain any dependencies
Audited in 8ms
```

Note that "upstream" ``pip install`` does support `-r /dev/stdin` and
doesn't support `-r -` .

## Test Plan

2 new tests added.

## Summary

I think the comment should explain it.

Closes #16856.

…data scripts" (#16861)

Reverts #16805 /
#16744

This also invalidates

- #16855
- #16857 

There's probably a way we can make this work, but detecting whether a
file is safe to read repeatedly is non-trivial, `is_file` returns `true`
for `/dev/stdin` on macOS so the approach from #16857 is not sufficient.
I spent a while trying to add `is_char_device` detection for macOS but
unfortunately that didn't work.

## Summary

Bumps the setup-uv action to v7 in the GitHub Actions integration docs.

## Test Plan

Built the documentation.