Bump imageio from 2.31.5 to 2.31.6

Bumps [imageio](https://github.com/imageio/imageio) from 2.31.5 to 2.31.6.
- [Release notes](https://github.com/imageio/imageio/releases)
- [Changelog](https://github.com/imageio/imageio/blob/master/CHANGELOG.md)
- [Commits](imageio/imageio@v2.31.5...v2.31.6)

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

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

pyproject.toml

@@ -78,7 +78,7 @@ doc = [
     "ansys-sphinx-theme==0.12.3",
     "grpcio==1.51.1",
     "imageio-ffmpeg==0.4.9",
-    "imageio==2.31.5",
+    "imageio==2.31.6",
     "jupyter_sphinx==0.4.0",
     "jupyterlab>=3.2.8",
     "matplotlib==3.8.0",