Remove support for Python 3.8

[kevin1kevin1k]

Description

This fixes #4115.
Support for Python 3.8 will be removed and 3.9+ will be required.

Development notes

Most syntactical changes in Python files are automatically applied by find . -name "*.py" -print0 | xargs -0 pyupgrade --py39-plus.
Other changes are done manually, with the references from the previous issue #2158 and PR #3060 for dropping 3.7

Developer Certificate of Origin

We need all contributions to comply with the Developer Certificate of Origin (DCO). All commits must be signed off by including a Signed-off-by line in the commit message. See our wiki for guidance.

If your PR is blocked due to unsigned commits, then you must follow the instructions under "Rebase the branch" on the GitHub Checks page for your PR. This will retroactively add the sign-off to all unsigned commits and allow the DCO check to pass.

Checklist

• Read the contributing guidelines
• Signed off each commit with a Developer Certificate of Origin (DCO)
• Opened this PR as a 'Draft Pull Request' if it is work-in-progress
• Updated the documentation to reflect the code changes
• Added a description of this change in the RELEASE.md file
• Added tests to cover my changes
• Checked if this change will affect Kedro-Viz, and if so, communicated that with the Viz team

[deepyaman]

Don't worry about the docs failure! It should be fixed once #4209 goes in.

[deepyaman]

Looks great! The unused imports do need to be removed, though. --unsafe-fixes may be good enough; just watch to make sure it doesn't do something dumb. :P

[kevin1kevin1k]

Looks great! The unused imports do need to be removed, though. --unsafe-fixes may be good enough; just watch to make sure it doesn't do something dumb. :P

That's a sharp catch 👀! I just noticed that I didn't install and run the pre-commit so it was not caught by ruff. After running them the unused imports (along with some deprecated stuff, such as UP035 typing.AbstractSet -> collections.abc.Set) are resolved.

[kevin1kevin1k]

By the way I just manually resolved the ruff errors that look like the following.

TCH003 Move standard library import `collections.OrderedDict` into a type-checking block

Can these be configured to fix automatically as well?

[merelcht]

Thanks for the contribution @kevin1kevin1k and congrats on your first Kedro PR! ⭐ 🔶

I've left some minor comments, but they're all non-blocking.

[ankatiyar]

Thanks @kevin1kevin1k! 💯

[kevin1kevin1k]

By the way, the typing changes are mainly due to https://peps.python.org/pep-0585/ in case anyone is curious.