* master:
  add null check when validating post logout redirect uri  #4295
  return setters back to public on AuthorizationRequest #4368
  update AspId host with UI updates
  update EF host with update UI
  Features/bootstrap update (#4427)
  add additional PKCE test
  add more detailed version logging
  cleanup in DefaultBackChannelLogoutService
  enhancements to add logout notification service as first class service (#4390)
  make apis that manipulate AuthenticationProperties public for client list and session id (#4411)

# Conflicts:
#	src/IdentityServer4/src/Configuration/DependencyInjection/BuilderExtensions/Additional.cs