Release 3.21.0
* Upgraded Spring boot to 2.4.4
* Upgraded OpenAPI generator to 5.1.1
* Updates to OpenAPI
* Allowed null in member attribute o365EmailAddresses_mu
* Fixed sponsored member creation at MU
* Specify language when calling MU pwd backend
* Password reset using UUID as token
* Suspending propagating tasks to engine
* Removing authorization for password strength check
* Added new methods for group stats
* Csv option for namespace configuration
* Fixed badge link in README
* Allowed only new thanks in publications
* Fixed optional ns config options