Bump flask-cors from 3.0.2 to 3.0.7

Bumps [flask-cors](https://github.com/corydolphin/flask-cors) from 3.0.2 to 3.0.7.
- [Release notes](https://github.com/corydolphin/flask-cors/releases)
- [Changelog](https://github.com/corydolphin/flask-cors/blob/master/CHANGELOG.md)
- [Commits](corydolphin/flask-cors@3.0.2...3.0.7)

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

requirements.txt

@@ -10,7 +10,7 @@ psutil == 5.4.6
 PyYAML >= 3.10
 sortedcontainers == 1.5.9
 flask == 1.0.2
-flask-cors == 3.0.2
+flask-cors ==3.0.7
 gunicorn >= 19.7.1