Bump MQTTnet from 2.8.5 to 3.0.8

[dependabot-preview]

Bumps MQTTnet from 2.8.5 to 3.0.8.

Release notes

Sourced from MQTTnet's releases.

v3.0.7

• [Core] Converted all pending methods to use async/await.
• [Core] Fixed an issue when serializing a PubRec (QoS 2) packet for MQTTv5.
• [Client] Fixed an issue when checking for revoked SSL certificates (thanks to @​cslutgen).
• [RpcClient] Added support for custom topic generation strategies.
• [Server] Refactoring of server certificate password classes (BREAKING CHANGE!).
• [Server] Fixed an issue with empty server certificate passwords (thanks to @​SeppPenner).
• [MQTTnet.Server] Added support for certificate passwords (BREAKING CHANGE IN CONFIG!)
• [MQTTnet.AspNetCore] Fixed an issue with MQTTv5 package serialization (#743, thanks to @​JanEggers, @​pcbing).

v3.0.6

• [Core] Nuget packages with symbols are now also published to improve debugging.
• [Core] Improve task handling (thanks to @​mwinterb)
• [ManagedClient] Fix a race condition in the message storage (thanks to @​PaulFake).
• [Server] Added items dictionary to client session in order to share data across interceptors as along as the session exists.
• [Server] Exposed CONNECT packet properties in Application Message and Subscription interceptor.
• [Server] Fixed: Sending Large packets with AspnetCore based connection throws System.ArgumentException.
• [Server] Fixed wrong usage of socket option NoDelay.
• [Server] Added remote certificate validation callback (thanks to @​rudacs).
• [Server] Add support for certificate passwords (thanks to @​cslutgen).
• [MQTTnet.Server] Added REST API for publishing basic messages.

v3.0.5

• [Server] Moved new socket options to TCP options to avoid incompatibility with Linux hosts.

v3.0.4

• [Core] Fixed wrong versions in nuget packages.
• [Server] The TCP address is now reused when starting which should prevent "port in used" error when restarting.

v3.0.3

• [Core] Fixed issues in MQTTv5 message encoding and decoding.
• [Core] Added extension method to allow usage of WebSocket4Net in clients to fix issues with AWS and Xamarin.
• [Core] Fixed usage of wrong data type for passwords (string -> byte[]).
• [Core] Fixed an ObjectDisposedException when sending data using a WebSocket channel.
• [Core] Performance optimizations.
• [Client] Added support for extended authentication exchange.
• [Client] Exposed MQTTv5 CONNACK values to client.
• [Client] Added MqttClientSubscribeOptionsBuilder.
• [Client] The disconnected handler is now executed in a new task to prevent deadlocks when reconnecting etc. (thanks to @​lizziebeans).
• [Client] Converted option DualMode into nullable boolean to preserve original value and avoid exceptions in IPv4 only networks (thanks to @​lavaflo).
• [Server] Exposed ClientCertificateRequired and CheckCertificateRevocation at TLS options.
• [Server] Exposed client certificate at client connection validator.
• [Server] The subscription interceptor now supports altering the entire topic filter.
• [Server] Exposed more properties to the connection validator context.
• [MQTTnet.Server] Added authentication support via Python script file.
• [MQTTnet.Server] Migrated the result of connection validations to ReasonCode (MQTTv5) instead of ReturnCode (MQTTv3 only) (BREAKING CHANGE!).

v3.0.3-rc3

• [Core] Fixed issues in MQTTv5 message encoding and decoding.
• [Core] Added extension method to allow usage of WebSocket4Net in clients to fix issues with AWS and Xamarin.

... (truncated)

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