build(deps-dev): bump slotscheck from 0.16.3 to 0.16.4 (#1549)

Bumps [slotscheck](https://github.com/ariebovenberg/slotscheck) from 0.16.3 to 0.16.4.
- [Release notes](https://github.com/ariebovenberg/slotscheck/releases)
- [Changelog](https://github.com/ariebovenberg/slotscheck/blob/main/CHANGELOG.rst)
- [Commits](https://github.com/ariebovenberg/slotscheck/commits)

---
updated-dependencies:
- dependency-name: slotscheck
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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Author: dependabot[bot]