Bump flask from 2.0.1 to 2.0.2 (#420)

Bumps [flask](https://github.com/pallets/flask) from 2.0.1 to 2.0.2.
- [Release notes](https://github.com/pallets/flask/releases)
- [Changelog](https://github.com/pallets/flask/blob/main/CHANGES.rst)
- [Commits](https://github.com/pallets/flask/compare/2.0.1...2.0.2

)

---
updated-dependencies:
- dependency-name: flask
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

requirements.txt

-Flask==2.0.1
+Flask==2.0.2
 gevent==21.8.0
 gunicorn==20.1.0
 fsspec==2021.5.0