Add support for Python 3.13

[nateprewitt]

This PR will start provisional testing on the recently released beta for Python 3.13. This will be used to catch any issues early before the official release in October.

[nateprewitt]

It looks like all 3.13 builds are failing on these two tests due to increased memory usage with paginators:

FAILED functional/leak/test_resource_leaks.py::TestDoesNotLeakMemory::test_create_single_paginator_memory_constant
FAILED functional/leak/test_resource_leaks.py::TestDoesNotLeakMemory::test_create_single_waiter_memory_constant

We'll need to figure out what the delta is between 3.12 and 3.13, then see if we have an issue or there's some form of new memory leak happening in the 3.13 interpreter.

Example Stacktrace
Memory increases ~10.8MB which exceeds our arbitrary 10MB threshold. I'd like to see what our change looks like in 3.12 to determine if we barely crossed a threshold we were already approaching or if this is a significant increase.

self = <tests.functional.leak.test_resource_leaks.TestDoesNotLeakMemory testMethod=test_create_single_paginator_memory_constant>

    def test_create_single_paginator_memory_constant(self):
        self.cmd('create_paginator', 's3', 'list_objects')
        self.cmd('free_paginators')
        self.record_memory()
        for _ in range(100):
            self.cmd('create_paginator', 's3', 'list_objects')
            self.cmd('free_paginators')
        self.record_memory()
        start, end = self.memory_samples
>       self.assertTrue((end - start) < self.MAX_GROWTH_BYTES, (end - start))
E       AssertionError: False is not true : 10878976

[jonathan343]

We'll need to figure out what the delta is between 3.12 and 3.13, then see if we have an issue or there's some form of new memory leak happening in the 3.13 interpreter.

I had a few minutes to compare the delta values between 3.12 a 3.13. The results are shown below:

Test	Python 3.12 Memory Delta (B)	Python 3.13 Memory Delta (B)	% Increase
test_create_memory_clients_in_loop	-9,052,160	176,128	-101.95 ??
test_create_memory_paginators_in_loop	1,503,232	1,937,408	28.88
test_create_memory_waiters_in_loop	1,675,264	1,794,048	7.09
test_create_single_client_memory_constant	1,785,856	10,338,304	478.90
test_create_single_paginator_memory_constant	2,551,808	11,886,592	365.81
test_create_single_waiter_memory_constant	2,490,368	11,870,208	376.64

There is definitely weird something going on with the 3.13 interpreter. I don't have to time to do a deeper dive now, but wanted to add this information here for future reference.

Notes:

1. What is going on with test_create_memory_clients_in_loop??

[jonathan343]

The Python 3.13.0 release candidate 3 was released on 10/01/2024 and made available in GitHub CI with actions/python-versions#308. I tested locally and this should resolved the current failures we're seeing. I requested some minor changes.

[jonathan343]