Bump ruff from 0.9.3 to 0.9.4 in /requirements

Bumps [ruff](https://github.com/astral-sh/ruff) from 0.9.3 to 0.9.4.
- [Release notes](https://github.com/astral-sh/ruff/releases)
- [Changelog](https://github.com/astral-sh/ruff/blob/main/CHANGELOG.md)
- [Commits](astral-sh/ruff@0.9.3...0.9.4)

---
updated-dependencies:
- dependency-name: ruff
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

requirements/style.txt

@@ -1,3 +1,3 @@
 # style
 mypy==1.14.1
-ruff==0.9.3
+ruff==0.9.4