Bump the dev-dependencies group with 4 updates

Bumps the dev-dependencies group with 4 updates: [pytest](https://github.com/pytest-dev/pytest), [black](https://github.com/psf/black), [coverage](https://github.com/nedbat/coveragepy) and [refurb](https://github.com/dosisod/refurb).


Updates `pytest` from 7.4.0 to 7.4.2
- [Release notes](https://github.com/pytest-dev/pytest/releases)
- [Changelog](https://github.com/pytest-dev/pytest/blob/main/CHANGELOG.rst)
- [Commits](pytest-dev/pytest@7.4.0...7.4.2)

Updates `black` from 23.7.0 to 23.9.1
- [Release notes](https://github.com/psf/black/releases)
- [Changelog](https://github.com/psf/black/blob/main/CHANGES.md)
- [Commits](psf/black@23.7.0...23.9.1)

Updates `coverage` from 7.3.0 to 7.3.1
- [Release notes](https://github.com/nedbat/coveragepy/releases)
- [Changelog](https://github.com/nedbat/coveragepy/blob/master/CHANGES.rst)
- [Commits](nedbat/coveragepy@7.3.0...7.3.1)

Updates `refurb` from 1.20.0 to 1.21.0
- [Release notes](https://github.com/dosisod/refurb/releases)
- [Commits](dosisod/refurb@v1.20.0...v1.21.0)

---
updated-dependencies:
- dependency-name: pytest
  dependency-type: direct:development
  update-type: version-update:semver-patch
  dependency-group: dev-dependencies
- dependency-name: black
  dependency-type: direct:development
  update-type: version-update:semver-minor
  dependency-group: dev-dependencies
- dependency-name: coverage
  dependency-type: direct:development
  update-type: version-update:semver-patch
  dependency-group: dev-dependencies
- dependency-name: refurb
  dependency-type: direct:development
  update-type: version-update:semver-minor
  dependency-group: dev-dependencies
...

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