[Win] "git-webkit pr" reports "FileNotFoundError: [WinError 2] The system cannot find the file specified"

PS C:\home\webkit\ga> python .\Tools\Scripts\git-webkit pr
Traceback (most recent call last):
  File "C:\home\webkit\ga\Tools\Scripts\git-webkit", line 82, in <module>
    sys.exit(program.main(
             ^^^^^^^^^^^^^
  File "C:\home\webkit\ga\Tools\Scripts\libraries\webkitscmpy\webkitscmpy\program\__init__.py", line 183, in main
    return parsed.main(
           ^^^^^^^^^^^^
  File "C:\home\webkit\ga\Tools\Scripts\libraries\webkitscmpy\webkitscmpy\program\pull_request.py", line 721, in main
    return cls.create_pull_request(repository, args, branch_point)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\home\webkit\ga\Tools\Scripts\libraries\webkitscmpy\webkitscmpy\program\pull_request.py", line 388, in create_pull_request
    if args.checks and not cls.pre_pr_checks(repository):
                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\home\webkit\ga\Tools\Scripts\libraries\webkitscmpy\webkitscmpy\program\pull_request.py", line 319, in pre_pr_checks
    command = run(path.split(' '), cwd=repository.root_path)
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\home\webkit\ga\Tools\Scripts\libraries\webkitcorepy\webkitcorepy\subprocess_utils.py", line 52, in run
    return subprocess.run(*popenargs, timeout=timeout, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Program Files\Python311\Lib\subprocess.py", line 548, in run
    with Popen(*popenargs, **kwargs) as process:
         ^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Program Files\Python311\Lib\subprocess.py", line 1024, in __init__
    self._execute_child(args, executable, preexec_fn, close_fds,
  File "C:\Program Files\Python311\Lib\subprocess.py", line 1509, in _execute_child
    hp, ht, pid, tid = _winapi.CreateProcess(executable, args,
                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
FileNotFoundError: [WinError 2] The system cannot find the file specified