Update plotly requirement from ~=5.5.0 to ~=5.6.0

Updates the requirements on [plotly](https://github.com/plotly/plotly.py) to permit the latest version.
- [Release notes](https://github.com/plotly/plotly.py/releases)
- [Changelog](https://github.com/plotly/plotly.py/blob/master/CHANGELOG.md)
- [Commits](plotly/plotly.py@v5.5.0...v5.6.0)

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

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

requirements.txt

@@ -9,7 +9,7 @@ h5py
 wandb==0.12.9
 google-cloud
 google-cloud-storage
-plotly~=5.5.0
+plotly~=5.6.0
 pytz~=2021.3
 setuptools~=59.0.1
 numpy==1.21.0