pythongh-105373: Remove PyArg_Parse() deprecation

There is no plan to deprecate PyArg_Parse().

The deprecation was added as a comment in the C API documentation in
2007 by commit 85eb8c1.

Author: vstinner

Doc/c-api/arg.rst

@@ -439,7 +439,6 @@ API Functions
    .. versionadded:: 3.2
 
 
-.. XXX deprecated, will be removed
 .. c:function:: int PyArg_Parse(PyObject *args, const char *format, ...)
 
    Function used to deconstruct the argument lists of "old-style" functions ---