Bump imageio from 2.22.0 to 2.22.1 in /requirements (#1527)

Bumps [imageio](https://github.com/imageio/imageio) from 2.22.0 to 2.22.1.
- [Release notes](https://github.com/imageio/imageio/releases)
- [Changelog](https://github.com/imageio/imageio/blob/master/CHANGELOG.md)
- [Commits](imageio/imageio@v2.22.0...v2.22.1)

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

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

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

Author: dependabot[bot]

requirements/requirements_docs.txt

@@ -3,7 +3,7 @@ ansys-mapdl-reader==0.52.0
 ansys-sphinx-theme==0.5.2
 grpcio==1.43.0
 imageio-ffmpeg==0.4.7
-imageio==2.22.0
+imageio==2.22.1
 jupyter_sphinx==0.4.0
 jupyterlab>=3.2.8
 matplotlib==3.6.0