Bump flask-cors from 4.0.2 to 6.0.0 in /servicex_app

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]

servicex_app/poetry.lock

@@ -17,7 +17,7 @@ jinja2 = "^3.1.5"
 flask = "^2.3.3"
 werkzeug = "^3.0.6"
 flask-wtf = "^1.0.1"
-flask-cors = "^4.0.1"
+flask-cors = "^6.0.0"
 wtforms = "^3.0.1"
 email-validator = "^1.3.0"
 Celery = "^5.2.0"