coveralls workflow fails on Python 3.5 and 3.6 with ubuntu-latest

[andy-maier]

See for example here: https://github.com/TheKevJames/coveralls-python/actions/runs/3765678072

This is caused by GitHub Actions having changed ubuntu-latest to now be Ubuntu 22.04, for which it no longer provides Python 3.5 and 3.6.

This can be fixed by specifying the use of ubuntu-20.04 for Python 3.5 and 3.6.

[andy-maier]

Fixed in PR #375

[gliptak]

could 3.5/3.6 dropped from supported?

https://www.python.org/downloads/

[andy-maier]

could 3.5/3.6 dropped from supported?

Not as far as our projects are concerned, because we still need to support Python 3.5 and 3.6, and we urgently need a solution for #252 and it would be great if we could get that solution also for Python 3.5 and 3.6. Note that I think I found a fix for #252 with PR #385.

[TheKevJames]

Python 3.5 and 3.6 have been dropped as they are now end-of-lifed. Please see #393 (comment) for more context.