Update changelog for 3.1.2 (#6379)
Update changelog for 3.1.2 (#6379)


waynemunro/orleans,galvesribeiro/orleans,benjaminpetit/orleans,ReubenBond/orleans,galvesribeiro/orleans,ElanHasson/orleans,dotnet/orleans,ibondy/orleans,ElanHasson/orleans,amccool/orleans,amccool/orleans,jthelin/orleans,yevhen/orleans,hoopsomuah/orleans,ibondy/orleans,hoopsomuah/orleans,yevhen/orleans,waynemunro/orleans,amccool/orleans,jason-bragg/orleans,veikkoeeva/orleans,dotnet/orleans