Bump imageio from 2.31.3 to 2.31.4

Bumps [imageio](https://github.com/imageio/imageio) from 2.31.3 to 2.31.4.
- [Release notes](https://github.com/imageio/imageio/releases)
- [Changelog](https://github.com/imageio/imageio/blob/master/CHANGELOG.md)
- [Commits](imageio/imageio@v2.31.3...v2.31.4)

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

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

requirements/requirements_docs.txt

@@ -1,5 +1,5 @@
 pypandoc==1.10
-imageio==2.31.3
+imageio==2.31.4
 numpydoc==1.4.0
 imageio-ffmpeg==0.4.7
 Sphinx<7.2.0; python_version == '3.8'