From Cygwin, with a Python interpreter installed for Windows and not
as a Cygwin package, a POSIX sh script check works if #!/usr/bin/env sh,
but not with a #!/bin/sh shebang.

Even if Cygwin populates correctly sh in /bin directory.

References:

• https://github.com/pre-commit/pre-commit/issues/1588

Tested under Windows 11 25H2 (26200.9106), pre-commit 3.8.0
and Cygwin 3.6.10-1.x86_64.