pypy-3.10 support

[jakkdl]

https://github.com/python-trio/trio/actions/runs/5430814069/jobs/9876779099?pr=2668

build currently fails with

../../../_temp/27281372-7da6-47ad-9c04-eadab99b87dc/pypy-c-jit-107527-ae3a931895a8-linux64/lib/pypy3.10/site-packages/trio/_tests/test_ssl.py:16: in <module>
    from OpenSSL import SSL
../../../_temp/27281372-7da6-47ad-9c04-eadab99b87dc/pypy-c-jit-107527-ae3a931895a8-linux64/lib/pypy3.10/site-packages/OpenSSL/__init__.py:8: in <module>
    from OpenSSL import SSL, crypto
../../../_temp/27281372-7da6-47ad-9c04-eadab99b87dc/pypy-c-jit-107527-ae3a931895a8-linux64/lib/pypy3.10/site-packages/OpenSSL/SSL.py:19: in <module>
    from OpenSSL.crypto import (
../../../_temp/27281372-7da6-47ad-9c04-eadab99b87dc/pypy-c-jit-107527-ae3a931895a8-linux64/lib/pypy3.10/site-packages/OpenSSL/crypto.py:21: in <module>
    from cryptography import utils, x509
../../../_temp/27281372-7da6-47ad-9c04-eadab99b87dc/pypy-c-jit-107527-ae3a931895a8-linux64/lib/pypy3.10/site-packages/cryptography/x509/__init__.py:6: in <module>
    from cryptography.x509 import certificate_transparency
../../../_temp/27281372-7da6-47ad-9c04-eadab99b87dc/pypy-c-jit-107527-ae3a931895a8-linux64/lib/pypy3.10/site-packages/cryptography/x509/certificate_transparency.py:10: in <module>
    from cryptography.hazmat.bindings._rust import x509 as rust_x509
E   ImportError: /home/runner/work/_temp/27281372-7da6-47ad-9c04-eadab99b87dc/pypy-c-jit-107527-ae3a931895a8-linux64/lib/pypy3.10/site-packages/cryptography/hazmat/bindings/_rust.pypy310-pp73-x86_64-linux-gnu.so: undefined symbol: PySlice_AdjustIndices

on test_dtls, test_highlevel_ssl_helpers and test_ssl.

[A5rocks]

We probably just have to bump our cryptography requirement.

[jakkdl]

yep, bumping to 41 worked - except now I'm hitting problems building ssl on pypy3.10 windows.
https://github.com/python-trio/trio/actions/runs/5444000246/jobs/9901247485#step:4:1050

[jakkdl]

I'm dropping windows-pypy3.10 in #2668 for now, anybody else feel free to go at that in another PR.

[Fuyukai]

This has, in fact, already been done?

[jakkdl]

Only for linux, looking at CI we might not be testing pypy at all on windows atm?

[A5rocks]

Seems fine to subsume this into the general CI megaissue if it's a basic issue/just a matter of updating matrix and seeing what breaks (if we don't know if this is up to date). Looking at that CI issue, I'm pretty sure this was about macOS pypy