build(deps): update ruff to v0.8.0

[shiftinv]

Summary

Updates ruff from v0.3.4 to v0.8.0.
There are essentially no runtime changes, other than some comparisons now using is instead of == where applicable, and two raises that have somehow been missing for a while (on a code path that should never be hit in the first place, but still).

The main changes are from these two rules:

• https://docs.astral.sh/ruff/rules/parenthesize-chained-operators/ (RUF021)
• https://docs.astral.sh/ruff/rules/type-comparison/ (E721)

Checklist

• If code changes were made, then they have been tested
  • I have updated the documentation to reflect the changes
  • I have formatted the code properly by running pdm lint
  • I have type-checked the code by running pdm pyright
• This PR fixes an issue
• This PR adds something new (e.g. new method or parameters)
• This PR is a breaking change (e.g. methods or parameters removed/renamed)
• This PR is not a code change (e.g. documentation, README, ...)