gh-141570: can_colorize: Expect fileno() to raise OSError, as documented (#141716)

In Fedora, we've been given a slightly incomplete reproducer for a problematic
Python 3.14 color-related change in argparse that leads to an exception when
Python is used from mod_wsgi: https://bugzilla.redhat.com/2414940

mod_wsgi replaces sys.stdout with a custom object that raises OSError on .fileno():

8460dbfcd5/src/server/wsgi_logger.c (L434-L440)

This should be supported, as the documentation of fileno explicitly says:

> An OSError is raised if the IO object does not use a file descriptor.

https://docs.python.org/3.14/library/io.html#io.IOBase.fileno

The previously expected exception inherits from OSError,
so it is still expected.

Fixes https://github.com/python/cpython/issues/141570

Co-authored-by: Cody Maloney <cmaloney@users.noreply.github.com>
Co-authored-by: Victor Stinner <vstinner@python.org>

Lib/_colorize.py

@@ -1,4 +1,3 @@
-import io
 import os
 import sys
 
@@ -330,7 +329,7 @@ def _safe_getenv(k: str, fallback: str | None = None) -> str | None:
 
     try:
         return os.isatty(file.fileno())
-    except io.UnsupportedOperation:
+    except OSError:
         return hasattr(file, "isatty") and file.isatty()