update ruff target-version to py310

[alec-bike]

What happened?

altair removed 3.9 from CI recently, but ruff target-version in pyproject.toml is still py39. @mattijn should this be updated? Note that there are quite a few changes that would result from this.

[mattijn]

Yes, if you are willing to work through the required changes according to ruff that would be great! I assume the required changes can be categorized in a few? Do you have insight in these?

[alec-bike]

Yes, there are only a few key changes:

• UP036: removal of ≥3.10 logic
• UP035: remove typing_extensions
• UP007: replace Union with |
• B905: zip strict parameter

I'm working through these in a local branch.

[alec-bike]

@mattijn I pushed a draft PR updating the minimum python version to 3.10 and ruff target-version to py10.

This branch passes the following tasks, when run on macOS:

• uv run task generate_schema_wrapper
• uv run task update-init-file
• uv run task test-all

It touches a lot of files:

• Key commits are by ruff error-code (where the files changed are mostly from running ruff check --fix --unsafe-fixes)
• I updated some vegalite/v6/schema generated files (as | now replaces Union, for example).