Build CPython 3.14 and PyPy 3.10 and 3.11 wheels

[dan-blanchard]

It's the time of year for annual version bumps!

This PR:

• Updates the versions of Python we build wheels for include 3.14 and drops 3.8
• Adds support for building PyPy wheels for 3.10 and 3.11
• Bumps the versions of all of the GitHub Actions we use to their latest versions
• Slightly reformats the CI.yml file for better readability
• Add a couple packages to the cross-platform test that are supposed to help prevent segfaults with QEMU

[dan-blanchard]

@milesgranger it took a little fiddling with the CI, but this should be good now

[milesgranger]

Thanks! I'll try to get a release out this weekend.