Bump flask from 2.0.3 to 3.1.0

Bumps [flask](https://github.com/pallets/flask) from 2.0.3 to 3.1.0.
- [Release notes](https://github.com/pallets/flask/releases)
- [Changelog](https://github.com/pallets/flask/blob/main/CHANGES.rst)
- [Commits](pallets/flask@2.0.3...3.1.0)

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

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

Author: dependabot[bot]

requirements.txt

@@ -1,4 +1,4 @@
-flask==2.0.3
+flask==3.1.0
 werkzeug==2.0.3
 requests==2.20.0
 gunicorn==22.0.0