[Snyk] Security upgrade tornado from 6.2 to 6.5.9

[anaconda-security-bot]

Snyk has created this PR to fix 1 vulnerabilities in the pip dependencies of this project.

Snyk changed the following file(s):

• requirements.txt

Breaking Change Risk

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[anaconda-security-bot]

This upgrade for Tornado contains a drop in support for older Python versions and several security-related behavioral changes that require verification.

Key Changes:

• Python Version Requirement: The minimum required Python version has been increased. Version 6.3 dropped support for Python 3.7, requiring 3.8+. Version 6.5 increased the requirement to Python 3.9+.
• Security Hardening & Behavioral Changes:
  • HTTP Client Redirects: SimpleAsyncHTTPClient now strips Authorization and Cookie headers when following a redirect to a different origin. Applications relying on this behavior may need to handle redirects manually.
  • Stricter Parsing: Parsing for HTTP headers (Transfer-Encoding, Content-Length), cookies, and multipart forms is now stricter to prevent security vulnerabilities like request smuggling. This could cause errors with previously accepted malformed requests.
  • Error Code Change: Requests with invalid characters in the method name now return a 400 error instead of 405.
• Deprecations:
  • RequestHandler.get_secure_cookie and set_secure_cookie have been renamed to get_signed_cookie and set_signed_cookie, respectively. The old names are deprecated aliases.
  • RequestHandler.clear_all_cookies and TwitterMixin are deprecated.

Recommendation:
Verify that your environment is running Python 3.9 or newer. Review application logs for new errors related to HTTP parsing after the upgrade, and test functionality that involves cross-origin redirects with authentication.

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