Refs #25589 -- Fixed admin_scripts test failure on Windows.

Traceback (most recent call last):
  File "tests\admin_scripts\tests.py", line 646, in test_startapp_unicode_name
    content = f.read()
  File "lib\encodings\cp1252.py", line 23, in decode
    return codecs.charmap_decode(input,self.errors,decoding_table)[0]
UnicodeDecodeError: 'charmap' codec can't decode byte 0x81 in position 46: character maps to <undefined>