Bump flask from 2.3.2 to 3.1.1

Bumps [flask](https://github.com/pallets/flask) from 2.3.2 to 3.1.1.
- [Release notes](https://github.com/pallets/flask/releases)
- [Changelog](https://github.com/pallets/flask/blob/main/CHANGES.rst)
- [Commits](pallets/flask@2.3.2...3.1.1)

---
updated-dependencies:
- dependency-name: flask
  dependency-version: 3.1.1
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

requirements.txt

@@ -1,4 +1,4 @@
-Flask==2.3.2
+Flask==3.1.1
 Flask-SQLAlchemy==3.0.5
 Flask-Login==0.6.2
 Werkzeug==3.1.3