Bump voila from 0.3.5 to 0.3.8

Bumps [voila](https://github.com/voila-dashboards/voila) from 0.3.5 to 0.3.8.
- [Release notes](https://github.com/voila-dashboards/voila/releases)
- [Changelog](https://github.com/voila-dashboards/voila/blob/main/CHANGELOG.md)
- [Commits](https://github.com/voila-dashboards/voila/compare/@voila-dashboards/voila@0.3.5...v0.3.8)

---
updated-dependencies:
- dependency-name: voila
  dependency-type: direct:production
...

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

requirements.txt

@@ -22,7 +22,7 @@ requests
 scikit-image
 scipy
 sidecar==0.5.1
-voila==0.3.5
+voila==0.3.8
 vtk==9.1.0
 
 jupyterlab-language-pack-fr-FR