Add Python 3.13 CI

[waahm7]

• Adds CI for Python 3.13
• Updated CD Pipeline to use Python 3.13 stable API due to deprecated function
• Moves our CI from hard coded creds to temporary creds
• Fixes some MQTT tests that were relying on hard coded creds in the environment.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[graebm]

the logic is copy/pasted a lot of time. How about backporting PyWeakref_GetRef to older versions

module.h:

#if PY_VERSION_HEX < 0x30D0000
// PyWeakref_GetRef() was added in Python3.13, make it available in older versions
int PyWeakref_GetRef(PyObject *ref, PyObject **pobj);
#endif

module.c:

#if PY_VERSION_HEX < 0x30D0000
// PyWeakref_GetRef() was added in Python3.13, make it available in older versions
int PyWeakref_GetRef(PyObject *ref, PyObject **pobj) {
    ...
}
#endif

[graebm]

https://github.com/python/cpython/blob/a9c2bc16349c2be3005f97249f3ae9699988f218/Objects/weakrefobject.c#L931-L947

[waahm7]

Not sure if we can backport it. PyWeakref_GetRef depends upon the internal function _PyWeakref_GetRef, which is probably located at https://fossies.org/linux/misc/Python-3.13.0rc2.tar.xz/Python-3.13.0rc2/Include/internal/pycore_weakref.h, and that function also depends upon several internal functions.

We can potentially add PyWeakref_GetRef, which calls PyWeakref_GetObject and also increments the ref count, so that we can avoid the copy-paste.

[waahm7]

Thanks, updated. I have created a new function which abstracts the differences between APIs into a single place, and we don't need to do any code duplication. I didn't define PyWeakref_GetRef for pre-Python 3.13 because I thought it would be confusing for future readers that we are calling the Python 3.13+ function, and having our own definition for pre-Python 3.13 which does something slightly different.