Bump flask from 0.12.2 to 2.3.2

Bumps [flask](https://github.com/pallets/flask) from 0.12.2 to 2.3.2.
- [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/0.12.2...2.3.2)

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

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

requirements.txt

@@ -2,7 +2,7 @@ alembic==0.9.2
 click==6.7
 coverage==4.4.1
 dominate==2.3.1
-Flask==0.12.2
+Flask==2.3.2
 Flask-Bootstrap==3.3.7.1
 Flask-Cache==0.13.1
 Flask-Script==2.0.5