Update: this release has been rolled back to the October 6 release to address an issue launching games which use Easy Anti-Cheat (EAC). When that issue is resolved, we'll update the client again to pick up these fixes. 
A new Steam client has been released and will be automatically downloaded.
Remote Play-  Fix black screen with PipeWire capture under KDE plasma
 
Linux-  Fix checking for execute privileges when picking a Steam Library folder location
 
Steam Cloud-  Fix issue causing extra work on reconnect to Steam