Bump flask from 2.0.1 to 2.2.3

Bumps [flask](https://github.com/pallets/flask) from 2.0.1 to 2.2.3.
- [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...2.2.3)

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

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

setup.py

@@ -35,7 +35,7 @@ setup(
     keywords='gliding ogn',
     packages=find_packages(exclude=['tests', 'tests.*']),
     install_requires=[
-        'Flask==2.0.1',
+        'Flask==2.2.3',
         'Flask-SQLAlchemy==2.5.1',
         'Flask-Migrate==3.0.1',
         'Flask-Bootstrap==3.3.7.1',