Bump flask from 3.1.0 to 3.1.1 in the pip group

Bumps the pip group with 1 update: [flask](https://github.com/pallets/flask).


Updates `flask` from 3.1.0 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@3.1.0...3.1.1)

---
updated-dependencies:
- dependency-name: flask
  dependency-version: 3.1.1
  dependency-type: indirect
  dependency-group: pip
...

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

Author: dependabot[bot]