Update plotly requirement from ~=5.20.0 to ~=5.21.0

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@v5.20.0...v5.21.0)

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

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

requirements.txt

@@ -9,7 +9,7 @@ h5py
 wandb==0.16.2
 google-cloud
 google-cloud-storage
-plotly~=5.20.0
+plotly~=5.21.0
 pytz>=2022.1
 setuptools~=69.5.1
 numpy>=1.21