gh-135237: fix setUp/tearDown of _colorize.can_colorize in test_argparse

[tpburns]

See test_regrtestTestColorized and test_pdbPdbTestColorize for similar tests with safe setups.

cpython/Lib/test/test_regrtest.py

Lines 2577 to 2580 in 24069fb

	withunittest.mock.patch(
	"_colorize.can_colorize", return_value=True
	):
	result=results.get_state(fail_env_changed=False)

cpython/Lib/test/test_pdb.py

Lines 4694 to 4701 in 24069fb

	defsetUp(self):
	self._original_can_colorize=_colorize.can_colorize
	# Force colorize to be enabled because we are sending data
	# to a StringIO
	_colorize.can_colorize=lambda*args, **kwargs: True
	deftearDown(self):
	_colorize.can_colorize=self._original_can_colorize

• Issue: _colorize.can_colorize safety in test_argparse #135237

[bedevere-bot]

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[ZeroIntensity]

Buildbot failures are unrelated

[hugovk]

Closing re: #135237 (comment)

Thanks anyway!