Bug report

Bug description:

Inspired by #146578, I wrote a checker to check all unicode format strings.

There are 2 kinds of errors.

1. There are ~8 real mistakes.
2. Comply with C99 for va_list: https://en.cppreference.com/w/c/variadic/va_arg.html
   Most of the changes are %d <-> %ld for int and Py_ssize_t.

I opened an draft PR #146616 containing only the fixes to display what could be changed. We can discuss and cherry pick some fixes in that PR.

CPython versions tested on:

CPython main branch

Operating systems tested on:

Linux

Linked PRs

• gh-146615: Fix format specifiers in error messages for consistency and correctness #146616
• gh-146615: Fix format specifiers in extension modules #146617
• gh-146615: Fix format specifiers in test cextensions #146618
• gh-146615: Fix format specifiers in Python/ directory #146619
• gh-146615: Fix format specifiers in Objects/ directory #146620
• gh-146615: Fix error message in method_get for invalid type argument #146634