This update for mailman fixes the following issues:

Update to 2.1.35 to fix 2 security issues: 

- A potential for for a list member to carry out an off-line brute force
  attack to obtain the list admin password has been reported by Andre
  Protas, Richard Cloke and Andy Nuttall of Apple.  This is fixed.
  CVE-2021-42096  (boo#1191959, LP:#1947639)
 
- A CSRF attack via the user options page could allow takeover of a users
  account.  This is fixed.  CVE-2021-42097  (boo#1191960, LP:#1947640)
- make package build reproducible (boo#1047218)

This update was imported from the openSUSE:Leap:15.2:Update update project.