[rdiffweb] rdiffweb vulnerable to Open Redirect

A lack of user input validation leads to an open redirect vulnerability in rdiffweb prior to 2.5.0a4.

References

• https://nvd.nist.gov/vuln/detail/CVE-2022-3438
• https://github.com/ikus060/rdiffweb/commit/4d464b467f14b8eb9103d7f5f0774e49995527c7
• https://huntr.dev/bounties/bc5689e4-221a-4200-a8ab-42c659f89f67
• https://github.com/advisories/GHSA-8g9m-vv69-7j99