Bump imageio-ffmpeg from 0.4.7 to 0.4.8 (#77)

Bumps [imageio-ffmpeg](https://github.com/imageio/imageio-ffmpeg) from 0.4.7 to 0.4.8.
- [Release notes](https://github.com/imageio/imageio-ffmpeg/releases)
- [Commits](imageio/imageio-ffmpeg@v0.4.7...v0.4.8)

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

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

Author: dependabot[bot]

pyproject.toml

@@ -51,7 +51,7 @@ doc = [
     "recommonmark==0.7.1",
     "matplotlib==3.6.2",
     "imageio==2.25.0",
-    "imageio-ffmpeg==0.4.7",
+    "imageio-ffmpeg==0.4.8",
     "pyvista==0.37.0",
     "numpydoc==1.5.0",
     "Sphinx==5.3.0",