Bump stardist from 0.8.3 to 0.8.4

Bumps [stardist](https://github.com/stardist/stardist) from 0.8.3 to 0.8.4.
- [Release notes](https://github.com/stardist/stardist/releases)
- [Commits](stardist/stardist@0.8.3...0.8.4)

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

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