Bump flask from 2.0 to 2.3.2 (#21)

Bumps [flask](https://github.com/pallets/flask) from 2.0 to 2.3.2.
- [Release notes](https://github.com/pallets/flask/releases)
- [Changelog](https://github.com/pallets/flask/blob/main/CHANGES.rst)
- [Commits](pallets/flask@2.0.0...2.3.2)

---
updated-dependencies:
- dependency-name: flask
  dependency-type: direct:development
...

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

requirements-dev.txt

@@ -1,4 +1,4 @@
-Flask==2.0
+Flask==2.3.2
 Pillow==9.3.0
 mock==4.0.3
 black==22.3.0