Bump pytest-randomly from 3.13.0 to 3.15.0 (#2710)

Bumps [pytest-randomly](https://github.com/pytest-dev/pytest-randomly) from 3.13.0 to 3.15.0.
- [Changelog](https://github.com/pytest-dev/pytest-randomly/blob/main/CHANGELOG.rst)
- [Commits](pytest-dev/pytest-randomly@3.13.0...3.15.0)

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>