build(deps): bump ruff from 0.7.2 to 0.8.4

Bumps [ruff](https://github.com/astral-sh/ruff) from 0.7.2 to 0.8.4.
- [Release notes](https://github.com/astral-sh/ruff/releases)
- [Changelog](https://github.com/astral-sh/ruff/blob/main/CHANGELOG.md)
- [Commits](astral-sh/ruff@0.7.2...0.8.4)

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

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

requirements.txt

@@ -3,4 +3,4 @@ icalendar >= 5.0.12
 pip>=21.0,<24.4
 pre-commit>=3.7.1
 recurring-ical-events>=2.2.1
-ruff==0.7.2
+ruff==0.8.4