Update dependency flask-cors to v3.0.9 [SECURITY]

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
flask-cors	==3.0.8 -> ==3.0.9

GitHub Vulnerability Alerts

CVE-2020-25032

An issue was discovered in Flask-CORS (aka CORS Middleware for Flask) before 3.0.9. It allows ../ directory traversal to access private resources because resource matching does not ensure that pathnames are in a canonical format.

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Release Notes

corydolphin/flask-cors (flask-cors)

v3.0.9

Compare Source

Security

• Escape path before evaluating resource rules (thanks to Colby Morgan). Prior to this, flask-cors incorrectly
  evaluated CORS resource matching before path expansion. E.g. "/api/../foo.txt" would incorrectly match resources for
  "/api/*" whereas the path actually expands simply to "/foo.txt"

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