argparse: Unexpanded replacements in "unknown action" exception

Bug report

Lines 1536 to 1537 in ad39f01

    
           if not callable(action_class): 
        
               raise ValueError('unknown action {action_class!r}')

There is a missing f there, so the replacements don't happen. Noticed accidentally because it broke snakeoil's test suite.

3.14, CPython main branch

Linux

pythongh-134970: Fix exception message in `argparse` module

gh-134970: Fix exception message in argparse module (GH-134971)

pythongh-134970: Fix exception message in argparse module (pythonGH-1…

[3.14] gh-134970: Fix exception message in argparse module (GH-134971) (

pythongh-134970: Fix exception message in argparse module (pythonGH-1…

	if not callable(action_class):
	raise ValueError('unknown action {action_class!r}')