AttributeError: 'Capture' object has no attribute 'flush' in Python 3.13

[jstvz]

Describe the bug:
When using the sarge.Capture class with io.TextIOWrapper in Python 3.13, an AttributeError is raised because the Capture object does not have a flush method.

To Reproduce:

1. Install Python 3.13.0.
2. Run the following code:

Python 3.13.0 (main, Oct  7 2024, 05:02:14) [Clang 16.0.0 (clang-1600.0.26.4)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import sarge, io, sys
>>> p = sarge.Command('echo reproduce_me', stdout=sarge.Capture(buffer_size=-1), stderr=sarge.Capture(buffer_size=-1), shell=True)
>>> p.run()
Command('echo reproduce_me')
>>> p.stdout_text = io.TextIOWrapper(p.stdout, encoding=sys.stdout.encoding)
>>> p = sarge.Command('echo reproduce_me', stdout=sarge.Capture(buffer_size=-1), stderr=sarge.Capture(buffer_size=-1), shell=True)
>>> p.run()
Exception ignored in: <_io.TextIOWrapper encoding='utf-8'>
Traceback (most recent call last):
  File "<python-input-5>", line 1, in <module>
AttributeError: 'Capture' object has no attribute 'flush'
Command('echo reproduce_me')

Expected behavior

Python 3.12.7 (main, Oct  1 2024, 02:05:46) [Clang 15.0.0 (clang-1500.3.9.4)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import sarge, io, sys
>>> p = sarge.Command('echo reproduce_me', stdout=sarge.Capture(buffer_size=-1), stderr=sarge.Capture(buffer_size=-1), shell=True)
>>> p.run()
Command('echo reproduce_me')
>>> p.stdout_text = io.TextIOWrapper(p.stdout, encoding=sys.stdout.encoding)
>>> p = sarge.Command('echo reproduce_me', stdout=sarge.Capture(buffer_size=-1)
... , stderr=sarge.Capture(buffer_size=-1), shell=True)
>>> p.run()
Command('echo reproduce_me')

Environment:

• Python Version: 3.13.0
• Sarge Version: v0.1.7.post1
• Operating System: macOS 15.1.1

Additional context:
In Python 3.13, errors raised during the close() method of IOBase objects are now logged using sys.unraisablehook (see gh-62948). My best guess is that the issue does not occur in Python 3.12 or earlier because such errors were silently ignored unless explicitly enabled for debugging.