Wrap use of PyWeakref_GET_OBJECT if we need it

[s-t-e-v-e-n-k]

Python 3.15 removes PyWeakref_GET_OBJECT, and the path forward is by using PyWeakref_GetRef, which was only added in Python 3.13. Add a wrapper for it if required, and switch to using PyWeakref_GetRef everywhere that called PyWeakref_GET_OBJECT.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.52%. Comparing base (2f8fd13) to head (6f1baad).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #273   +/-   ##
=======================================
  Coverage   97.52%   97.52%           
=======================================
  Files          24       24           
  Lines        1093     1093           
  Branches      167      167           
=======================================
  Hits         1066     1066           
  Misses         13       13           
  Partials       14       14           

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[MatthieuDartiailh]

Thanks for your contribution. Could you also add 3.15 to the test and release matrix ?

[s-t-e-v-e-n-k]

Thanks for your contribution. Could you also add 3.15 to the test and release matrix ?

I have not added it to the release matrix for now, since 3.15 final isn't out quite yet.

[MatthieuDartiailh]

The typing error is unrelated so I will merge thanks