build(deps): bump flask-cors from 3.0.10 to 4.0.1 in /backend

Bumps [flask-cors](https://github.com/corydolphin/flask-cors) from 3.0.10 to 4.0.1.
- [Release notes](https://github.com/corydolphin/flask-cors/releases)
- [Changelog](https://github.com/corydolphin/flask-cors/blob/main/CHANGELOG.md)
- [Commits](corydolphin/flask-cors@3.0.10...4.0.1)

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

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

backend/requirements.txt

@@ -1,6 +1,6 @@
 click==8.1.3
 Flask==2.2.5
-Flask-Cors==3.0.10
+Flask-Cors==4.0.1
 itsdangerous==2.1.2
 Jinja2==3.1.3
 MarkupSafe==2.1.1