update flask-cors due to vulnerability

[AlbertSnows]

Link to JIRA ticket if there is one: https://ctds-planx.atlassian.net/browse/PPS-1539

New Features

Breaking Changes

Bug Fixes

Improvements

Dependency updates

Deployment changes

[github-actions[bot]]

The style in this PR agrees with black. :heavy_check_mark:

This formatting comment was generated automatically by a script in uc-cdis/wool.

[github-actions[bot]]

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Please find the detailed integration test report here

Please find the ci env pod logs here