Bump flask from 1.0.4 to 2.3.2 in /website

Bumps [flask](https://github.com/pallets/flask) from 1.0.4 to 2.3.2.
- [Release notes](https://github.com/pallets/flask/releases)
- [Changelog](https://github.com/pallets/flask/blob/main/CHANGES.rst)
- [Commits](pallets/flask@1.0.4...2.3.2)

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

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

website/requirements.txt

@@ -6,7 +6,7 @@ sqlalchemy==1.3.12
 beautifulsoup4
 rpy2==3.3.6
 Jinja2==2.11.3
-Flask==1.0.4
+Flask==2.3.2
 Flask-Assets==0.12
 Flask-Classful==0.13.1
 Flask-SQLAlchemy==2.4.4