Bump kaleido from 0.0.3.post1 to 0.2.1

Bumps [kaleido](https://github.com/plotly/Kaleido) from 0.0.3.post1 to 0.2.1.
- [Release notes](https://github.com/plotly/Kaleido/releases)
- [Commits](plotly/Kaleido@v0.0.3.post1...v0.2.1)

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

requirements.txt

@@ -9,7 +9,7 @@ PyYAML==5.3.1
 jinja2==2.11.2
 flask==1.1.2
 plotly==4.14.1
-kaleido==0.0.3.post1
+kaleido==0.2.1
 pandas==1.1.5
 flask-minify==0.29
 werkzeug==1.0.1