Bump flask-cors from 4.0.2 to 6.0.0 in /sdarq/backend

Bumps [flask-cors](https://github.com/corydolphin/flask-cors) from 4.0.2 to 6.0.0.
- [Release notes](https://github.com/corydolphin/flask-cors/releases)
- [Changelog](https://github.com/corydolphin/flask-cors/blob/main/CHANGELOG.md)
- [Commits](corydolphin/flask-cors@4.0.2...6.0.0)

---
updated-dependencies:
- dependency-name: flask-cors
  dependency-version: 6.0.0
  dependency-type: direct:production
...

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

Author: dependabot[bot]

sdarq/backend/requirements.txt

@@ -3,7 +3,7 @@ Flask-Limiter==3.8.0
 requests>=2.32.3
 requests-oauthlib>=1.0.0
 urllib3==1.26.19
-flask-cors==4.0.2
+flask-cors==6.0.0
 virtualenv==20.26.6
 jira==2.0.0
 gunicorn[gevent]>= 1.4