⬆️ bump filelock from 3.13.1 to 3.15.1

Bumps [filelock](https://github.com/tox-dev/py-filelock) from 3.13.1 to 3.15.1.
- [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@3.13.1...3.15.1)

---
updated-dependencies:
- dependency-name: filelock
  dependency-type: indirect
  update-type: version-update:semver-minor
...

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