build(deps): update scikit-image requirement from ~=0.22 to ~=0.19 in /requirements (#2971)

build(deps): update scikit-image requirement in /requirements

Updates the requirements on [scikit-image](https://github.com/scikit-image/scikit-image) to permit the latest version.
- [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@v0.24.0...v0.19.3)

---
updated-dependencies:
- dependency-name: scikit-image
  dependency-type: direct:production
...

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

Author: dependabot[bot]

requirements/_docs.txt

@@ -30,4 +30,4 @@ pydantic > 1.0.0, < 3.0.0
 # todo: until this has resolution - https://github.com/sphinx-gallery/sphinx-gallery/issues/1290
 # Image
 scikit-image ~=0.22; python_version < "3.10"
-scikit-image ~=0.24; python_version > "3.9"  # we do not use `> =` because of oldest replcement
+scikit-image ~=0.19; python_version > "3.9"  # we do not use `> =` because of oldest replcement