chore(deps): update ruff requirement from ==0.7.* to ==0.8.* (#197)

Updates the requirements on [ruff](https://github.com/astral-sh/ruff) to permit the latest version.
- [Release notes](https://github.com/astral-sh/ruff/releases)
- [Changelog](https://github.com/astral-sh/ruff/blob/main/CHANGELOG.md)
- [Commits](astral-sh/ruff@0.7.0...0.8.0)

---
updated-dependencies:
- dependency-name: ruff
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Charles Moore <[email protected]>

requirements-testing.txt

@@ -5,6 +5,6 @@ pytest-cov == 6.0.*
 pytest-timeout == 2.3.*
 pytest-xdist == 3.6.*
 black == 24.*
-ruff == 0.7.*
+ruff == 0.8.*
 mypy == 1.13.*
 psutil >= 5.9,< 6.2