[3.14] gh-139590: Stricter ruff rules for Tools/wasm (GH-139752)

[miss-islington]

(cherry picked from commit 678e0b8)

Co-authored-by: sobolevn mail@sobolevn.me

• Issue: Set up Ruff formatting for wasi #139590

[hugovk]

I pushed Ruff's lint+format fixes, which use target-version = "py310" (via .ruff.toml).

But Tools/wasm/mypy.ini has:

# Make sure the wasm can be run using Python 3.8:
python_version = 3.8

So there's a mismatch.

Also Tools/wasm/mypy.ini was deleted in main (ee49644 and 14291fa) so shall we also delete it in these backports?

[brettcannon]

I opted out of mypy for the WASI stuff, so that's a question for @freakboy3742 and @hoodmane .