Check if we still need to use Python 3.6.10 in CI

[Alex Walker]

Problem to Solve

We currently set the Python environment to version 3.6.10 with a pyenv command in automation.yml. But most users will be on Python 3.8 or 3.9 by now.

Proposed Solution

Try using Python 3.8 (or whatever is the standard when this issue is tackled).

Additional Information

We would ideally use whatever Python is installed in Grabl, thus eliminating the need for a pyenv call in this Grabl CI file.

[Alex Walker]

This issue was tackled when we upgraded our Ubuntu images to 22.04.