Fix CI failures on Github

[mcdonc]

Issue to help diagnose and fix CI problems with specific arch/OS types/versions.

So far:

• add 3.13 to checked ci
• use macos-sonoma instead of macos-latest to test under macos (later releases seem to fail)
• merge musicinmybrain's local frame proxy fix for 3.13

[stevepiercy]

@mcdonc I don't know if you found this resource for available macOS images.

https://github.com/actions/runner-images?tab=readme-ov-file#available-images

Each item has a link to its README with Python and other system requirements.

Also the second example at the following link shows how to exclude a specific Python version from macos-latest and windows-latest, after first including them.

https://github.com/actions/setup-python/blob/main/docs/advanced-usage.md#matrix-testing

[mcdonc]

@mcdonc I don't know if you found this resource for available macOS images.

https://github.com/actions/runner-images?tab=readme-ov-file#available-images

Each item has a link to its README with Python and other system requirements.

Also the second example at the following link shows how to exclude a specific Python version from macos-latest and windows-latest, after first including them.

https://github.com/actions/setup-python/blob/main/docs/advanced-usage.md#matrix-testing

Thanks! I had seen the first link, but I think it's sufficient to test Venusian on an old MacOS version only on amd64 for now without complicating it across architectures. Maybe once MacOS is no longer supported on Intel we can change things.