3.5.0

• Added CallbackManager.Subscribe overloads that accept callbacks returning Task.
• Added SteamClient.GetRequiredHandler<T>, which throws if the handler is not registered.
• Added SteamUserStats.DownloadLeaderboardEntriesForUsers.
• Added BypassProxiesOfType to CDN Server.
• Replaced the vendored LZMA decoder with a span-based decoder.
• Vectorized Adler-32 checksums.
• Fixed GetAuthSessionTicket hanging or throwing "Ticket verification failed" when called repeatedly.
• Fixed a crash or disconnect when messages were sent from multiple threads at the same time on an encrypted connection.
• Fixed a NullReferenceException when sending a message while an encrypted connection is disconnecting.
• Fixed an exception when closing an already disposed websocket.
• Fixed decrypted depot chunk length validation.
• Short or corrupt VZstd chunks now throw InvalidDataException.
• Updated Steam enums and protobufs.
• Updated dependencies.

BREAKING CHANGES

• SteamCloud now uses unified messages: RequestUGCDetails, GetSingleFileInfo and ShareFile return Task, and their callbacks no longer derive from CallbackMsg.
• Removed the deprecated IsSteamDeck from LogOnDetails, use GamingDeviceType instead.
• Removed steammessages_clientserver_ufs protobufs.