Bump scikit-image from 0.18.3 to 0.19.1 (#463)

Bumps [scikit-image](https://github.com/scikit-image/scikit-image) from 0.18.3 to 0.19.1.
- [Release notes](https://github.com/scikit-image/scikit-image/releases)
- [Changelog](https://github.com/scikit-image/scikit-image/blob/main/RELEASE.txt)
- [Commits](https://github.com/scikit-image/scikit-image/compare/v0.18.3...v0.19.1

)

---
updated-dependencies:
- dependency-name: scikit-image
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

requirements.txt

@@ -22,7 +22,7 @@ Pyqtree==1.0.0
 requests==2.26.0
 sciencebeam-alignment==0.0.5
 sciencebeam-utils==0.1.4
-scikit-image==0.18.3
+scikit-image==0.19.1
 sklearn-crfsuite==0.3.6
 scikit-learn>=0.24.2
 tensorflow-transform==1.3.0