Bump plotly from 4.8.2 to 4.9.0

Bumps [plotly](https://github.com/plotly/plotly.py) from 4.8.2 to 4.9.0.
- [Release notes](https://github.com/plotly/plotly.py/releases)
- [Changelog](https://github.com/plotly/plotly.py/blob/master/CHANGELOG.md)
- [Commits](https://github.com/plotly/plotly.py/compare/v4.8.2...v4.9.0)

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

requirements-plot.txt

@@ -1,5 +1,5 @@
 # Include all requirements to run the bot.
 -r requirements.txt
 
-plotly==4.8.2
+plotly==4.9.0