Bump flask-cors in /M220P - MongoDB for Python Developers/Files

Bumps [flask-cors](https://github.com/corydolphin/flask-cors) from 3.0.3 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@3.0.3...3.0.9)

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

M220P - MongoDB for Python Developers/Files/requirements.txt

@@ -5,7 +5,7 @@ pymongo==3.7.2
 dnspython==1.15.0
 pytest==3.3.0
 pytest-flask==0.10.0
-Flask-Cors==3.0.3
+Flask-Cors==3.0.9
 flask-jwt-extended==3.7.0
 faker==0.8.13
 jupyter==1.0.0