chore(deps): update dependency flask-cors to v6 [security]

Author: renovate[bot]

requirements.txt

@@ -6,7 +6,7 @@ colorama==0.4.4
 Flask==1.1.4
 Flask-RESTful==0.3.9
 flask-restplus==0.13.0
-Flask-Cors==3.0.10
+Flask-Cors==6.0.0
 uWSGI==2.0.18
 Werkzeug==0.16.1
 tweepy==3.8.0