chore(deps): update ruff requirement from ~=0.8.2 to ~=0.8.4

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@0.8.2...0.8.4)

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

Signed-off-by: dependabot[bot] <[email protected]>

requirements-testing.txt

@@ -14,6 +14,6 @@ types-python-dateutil ~= 2.9
 mypy ~= 1.13
 types-requests ~= 2.31; python_version < "3.10"
 types-requests ~= 2.32; python_version >= "3.10"
-ruff ~= 0.8.2
+ruff ~= 0.8.4
 twine ~= 6.0
 types-psutil ~= 5.9