Bump flask-cors from 3.0.8 to 3.0.9

Bumps [flask-cors](https://github.com/corydolphin/flask-cors) from 3.0.8 to 3.0.9.
- [Release notes](https://github.com/corydolphin/flask-cors/releases)
- [Changelog](https://github.com/corydolphin/flask-cors/blob/master/CHANGELOG.md)
- [Commits](corydolphin/flask-cors@3.0.8...3.0.9)

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

requirements.txt

@@ -10,7 +10,7 @@ DateTime==4.3
 fake-useragent==0.1.11
 Flask==1.1.2
 Flask-Caching==1.10.1
-Flask-Cors==3.0.8
+Flask-Cors==3.0.9
 flask-marshmallow==0.14.0
 Flask-Migrate==2.7.0
 Flask-SQLAlchemy==2.5.1