Update flask-cors requirement from <4,>=3.0.8 to >=3.0.8,<6

Updates the requirements on [flask-cors](https://github.com/corydolphin/flask-cors) to permit the latest version.
- [Release notes](https://github.com/corydolphin/flask-cors/releases)
- [Changelog](https://github.com/corydolphin/flask-cors/blob/main/CHANGELOG.md)
- [Commits](corydolphin/flask-cors@3.0.8...5.0.0)

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

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

pyproject.toml

@@ -32,7 +32,7 @@ dependencies = [
     "email_validator>=1.0,<3",
     "Flask>=2,<4",
     "Flask-Babel>=1.0,<4",
-    "Flask-Cors>=3.0.8,<4",
+    "Flask-Cors>=3.0.8,<6",
     "Flask-Limiter>=2.6,<3",
     "Flask-Mail>=0.9.1,<1",
     "Flask-Migrate>=2.5.3,<5", # Not following semantic versioning (e.g. https://github.com/miguelgrinberg/flask-migrate/commit/1af28ba273de6c88544623b8dc02dd539340294b)