Add support for Python 3.11

[hugovk]

Python 3.11 was released on 2022-10-24 🚀

Also allow other jobs to continue if one job fails (lets us see if it's just 3.6 is having problems or all of them)

And bump GitHub Actions.

[hugovk]

Passed on my fork 🤷

https://github.com/hugovk/Products.ZopeTree/actions/runs/3509363286

At least we know it's not from old actions and it is unique to 3.6... (And 3.11 passes 🎉)

https://github.com/jugmac00/Products.ZopeTree/actions/runs/3509370534/jobs/5878427857

This looks relevant to "Version 3.6 was not found in the local cache":

actions/setup-python#544

[hugovk]

Aha, mine used ubuntu-20.04:

https://github.com/hugovk/Products.ZopeTree/actions/runs/3509363286/jobs/5878411650

And yours used ubuntu-22.04:

https://github.com/jugmac00/Products.ZopeTree/actions/runs/3509370534/jobs/5878427857

[hugovk]

Yep, looks like 3.6 isn't on any of the 22.04 images:

https://github.com/raw/actions/python-versions/main/versions-manifest.json

So either use 20.04 for all Python versions (until dropping 3.6) or adjust the matrix to only use ubuntu-20.04 for 3.6 and ubuntu-latest for the others, and/or wait for a resolution to actions/setup-python#544.

(I'd go for the simplicity of option 1.)

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Edit: and I can repro the failure in my fork on another branch when pinning to 22.04:
https://github.com/hugovk/Products.ZopeTree/actions/runs/3509410199 👍

[jugmac00]

Thanks @hugovk! Great catch!