fix: Make org.jpy.PyLib.getCurrentLocals/Globals work for Python 3.13

[jmao-denver]

Python 3.13.0rc1 includes PEP667 (https://peps.python.org/pep-0667) and it made PyEval_GetLocals() no longer behave the same way as in Python 3.12 and older, which could be a bug to report to the cpython team but probably not worth it as it is marked as deprecated together with PyEval_GetGlobals().

[devinrsmith]

This seems like a good change. Should we prefer to instead increment locals for python <= 3.12, and always XDECREF? At least from the PEPs example of migrating PyEval_GetLocals, it seems like incrementing the ref may be the more canonical approach?

locals = PyEval_GetLocals();
if (locals == NULL) {
    goto error_handler;
}
Py_INCREF(locals);

to

locals = PyEval_GetFrameLocals();
if (locals == NULL) {
    goto error_handler;
}

[jmao-denver]

This seems like a good change. Should we prefer to instead increment locals for python <= 3.12, and always XDECREF? At least from the PEPs example of migrating PyEval_GetLocals, it seems like incrementing the ref may be the more canonical approach?

locals = PyEval_GetLocals();
if (locals == NULL) {
    goto error_handler;
}
Py_INCREF(locals);

to

locals = PyEval_GetFrameLocals();
if (locals == NULL) {
    goto error_handler;
}

I wasn't very comfortable with the existing pattern (use borrowed ref) on globals/locals either, but it wasn't critical when GIL guarantees the thread-safetly. Now with free-threaded Python is just around the corner it is time to use the correct pattern for borrowed refs.