Bump kaleido from 0.0.3.post1 to 0.2.1.post1

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

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

requirements.txt

@@ -4,7 +4,7 @@ PyYAML
 jinja2~=2.11.3
 flask==1.1.2
 plotly~=4.14.3
-kaleido==0.0.3.post1
+kaleido==0.2.1.post1
 pandas~=1.2.4
 werkzeug==1.0.1
 redis==3.5.3