Bump flask-cors from 3.0.8 to 3.0.9 in /requirements

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>

Author: dependabot[bot]

requirements/local.txt

@@ -5,7 +5,7 @@ certifi==2019.11.28
 chardet==3.0.4
 Click==7.0
 Flask==1.1.1
-Flask-Cors==3.0.8
+Flask-Cors==3.0.9
 gunicorn==20.0.4
 idna==2.8
 importlib-metadata==1.3.0

requirements/production.txt

@@ -5,7 +5,7 @@ certifi==2019.11.28
 chardet==3.0.4
 Click==7.0
 Flask==1.1.1
-Flask-Cors==3.0.8
+Flask-Cors==3.0.9
 gunicorn==20.0.4
 idna==2.8
 importlib-metadata==1.3.0