argparse: when wrong choice is selected, the error message prints available choices using `repr()` instead of `str()`

# Bug report

### Bug description:

 I tried using StrEnum for choices and it printed `choose from <Enum.FOO: 'foo'>, ...` instead of `choose from foo, ....`.

Fix in https://github.com/python/cpython/pull/117766

### CPython versions tested on:

3.12

### Operating systems tested on:

Linux


### Linked PRs
* gh-117766