Bump flask from 3.1.1 to 3.1.3 in /samples/python

Bumps [flask](https://github.com/pallets/flask) from 3.1.1 to 3.1.3.
- [Release notes](https://github.com/pallets/flask/releases)
- [Changelog](https://github.com/pallets/flask/blob/main/CHANGES.rst)
- [Commits](pallets/flask@3.1.1...3.1.3)

---
updated-dependencies:
- dependency-name: flask
  dependency-version: 3.1.3
  dependency-type: direct:production
...

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

Author: dependabot[bot]

samples/python/requirements.txt

@@ -11,7 +11,7 @@ cryptojwt==1.10.0
 dill==0.3.9
 docopt==0.6.2
 filelock==3.25.0
-Flask==3.1.1
+Flask==3.1.3
 idna==3.10
 idpyoidc==5.0.0
 isort==5.13.2