Bump flask-cors from 3.0.10 to 4.0.0 in /back

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...v4.0.0)

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

Signed-off-by: dependabot[bot] <[email protected]>

back/requirements.txt

@@ -1,6 +1,6 @@
 ariadne==0.19.1
 Flask==2.3.2
-Flask-Cors==3.0.10
+Flask-Cors==4.0.0
 sentry-sdk[flask]==1.25.1
 PyMySQL==1.1.0
 peewee==3.16.2