Bump scikit-image from 0.17.2 to 0.18.1

Bumps [scikit-image](https://github.com/scikit-image/scikit-image) from 0.17.2 to 0.18.1.
- [Release notes](https://github.com/scikit-image/scikit-image/releases)
- [Changelog](https://github.com/scikit-image/scikit-image/blob/main/RELEASE.txt)
- [Commits](scikit-image/scikit-image@v0.17.2...v0.18.1)

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

requirements.txt

@@ -10,7 +10,7 @@ opencv-contrib-python==4.5.1.48
 numpy>=1.14.5
 pandas==1.2.4
 scikit-learn== 0.24.1
-scikit-image==0.17.2
+scikit-image==0.18.1
 scipy==1.4.1
 pure-predict==0.0.4
 numba==0.53.1