Bump filedirname from 2.6.0 to 2.8.0

Bumps [filedirname](https://github.com/bevry/filedirname) from 2.6.0 to 2.8.0.
- [Changelog](https://github.com/bevry/filedirname/blob/master/HISTORY.md)
- [Commits](bevry/filedirname@v2.6.0...v2.8.0)

---
updated-dependencies:
- dependency-name: filedirname
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>