Pin CI image to `windows-2025` (RustPython#6148)

For more info see see:
https://github.blog/changelog/2025-07-31-github-actions-new-apis-and-windows-latest-migration-notice/

Update `{site,sysconfig}.py` from 3.13.7 (RustPython#6132)

* Update `{site,sysconfig}.py` from 3.13.7

* Update vm/src/stdlib/sysconfig.rs

Merge pull request RustPython#5789 from coolreader18/crt_fd-rework

Rework crt_fd to be more aligned with io-safety

Update some tests from 3.13.7 (RustPython#6108)

* Update `test_opcache.py`

* Update test_optparse.py

* Add some missing folders & test files

* Update `test_long.py` and impl "is_integer" for int

* Update `support/hypothesis_helper.py` from 3.13.7

* Update test_binascii

* Update test_math

* Add `test_math_property.py`

* Update `test_property.py` from 3.13.7

* Update `test_cmath.py` from 3.13.7

* Unmark passing tests

* Update `test_ucn.py` from 3.13.7

* Mark failing tests

* Add `site-packages` dir

Merge pull request RustPython#6085 from youknowone/dict-update

Merge pull request RustPython#6085 from youknowone/dict-update

Update `contextlib` from 3.13.5, (RustPython#6056)

* Update `contextlib` from 3.13.5

* Add `test_contextlib_async.py`

stdlib(sqlite): Raise ProgrammingError in closed Blob context manager (…

…RustPython#6041)

Fix test_typing.test_args_kwargs (RustPython#6012)

Update `test_tuple.py` from 3.13.5 (RustPython#5966)