`modsupport.c`: Missing `va_end` in `_abiinfo_raise`

# Bug report

### Bug description:

# Bug Report

### modsupport.c: Missing va_end in _abiinfo_raise

`va_start(vargs, format)` at line 689 but `va_end(vargs)` never called on any path. UB per C99 7.15.1.

This is a sub-issue of https://github.com/python/cpython/issues/146102 with original [gist details](https://gist.github.com/devdanzin/d1a6ab9f62970be0cae139366ce3c482)

### CPython versions tested on:

CPython main branch

### Operating systems tested on:

Windows


### Linked PRs
* gh-146387

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`modsupport.c`: Missing `va_end` in `_abiinfo_raise` #146386

Bug report

Bug description:

Bug Report