…ribute or not (#134972)

Skip test that checks whether setattr interns the attribute or not

The details of when a string is being interned or not is implementation
dependent.

…#134955)

* Hard-cap max file descriptors in subprocess test fd_status

On some systems, `SC_OPEN_MAX` may return a very large value (i.e. 10**30), leading to the subprocess test timing out (or run forever).
Prevent this situation by applying a hard cap on how many file descriptors are checked.

* Fix typo in usage docstring

s/fd_stats/fd_status/