build(deps): bump flask-cors from 3.0.10 to 4.0.0 in /backend (#2084)

Bumps [flask-cors](https://github.com/corydolphin/flask-cors) from 3.0.10 to 4.0.0.
- [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...4.0.0)

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

backend/requirements.txt

@@ -2,7 +2,7 @@
 connexion==2.14.2
 datadog==0.47.0
 Flask==2.2.3
-Flask-Cors==3.0.10
+Flask-Cors==4.0.0
 flask-talisman==1.1.0
 google-cloud-storage==2.11.0
 gunicorn==21.2.0