chore(deps): Bump flask from 2.3.3 to 3.1.2 in /src/python-app

Bumps [flask](https://github.com/pallets/flask) from 2.3.3 to 3.1.2.
- [Release notes](https://github.com/pallets/flask/releases)
- [Changelog](https://github.com/pallets/flask/blob/main/CHANGES.rst)
- [Commits](pallets/flask@2.3.3...3.1.2)

---
updated-dependencies:
- dependency-name: flask
  dependency-version: 3.1.2
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

src/python-app/requirements.txt

@@ -1,4 +1,4 @@
-Flask==2.3.3
+Flask==3.1.2
 Werkzeug==3.1.3
 psutil==7.1.3
 gunicorn==23.0.0