Security update for rubygem-rack

This update for rubygem-rack fixes the following issues: Update to version 2.2.20 bsc1251936 CVE-2025-61919: Fixed application/x-www-form-urlencoded, callingrack.input.readnil without enforcing a length or cap bsc1251936 CVE-2025-61780: Fixed improper handling of headers in Rack::Sendfile allows...