Bump filelock from 3.15.3 to 3.15.4

Bumps [filelock](https://github.com/tox-dev/py-filelock) from 3.15.3 to 3.15.4.
- [Release notes](https://github.com/tox-dev/py-filelock/releases)
- [Changelog](https://github.com/tox-dev/filelock/blob/main/docs/changelog.rst)
- [Commits](tox-dev/filelock@3.15.3...3.15.4)

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

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