Bump flask from 2.1.2 to 2.2.3 (#21)

Bumps [flask](https://github.com/pallets/flask) from 2.1.2 to 2.2.3.
- [Release notes](https://github.com/pallets/flask/releases)
- [Changelog](https://github.com/pallets/flask/blob/main/CHANGES.rst)
- [Commits](pallets/flask@2.1.2...2.2.3)

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

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

Author: dependabot[bot]

requirements.txt

@@ -1,4 +1,4 @@
-Flask==2.1.2
+Flask==2.2.3
 Flask-SQLAlchemy==2.5.1
 gunicorn==20.1.0
 python-dateutil==2.8.2