Reset release notes

.github/workflows/ReleaseNotes.md

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-* [Core] Fixed several dead locks by implementing a new async signal (#1552)
-* [Client] All waiting tasks will now fail when the client connection gets closed. This fixes several freezes (#1561)
-* [ManagedClient] The topic is no longer declared as invalid if a topic alias is used (#1395)
-* [Server] Fixed duplicated invocation of the event _ClientAcknowledgedPublishPacketAsync_ for QoS level 2 (#1550)
-* [Server] Fixed issue in upgrading and downgrading of QoS levels for subscriptions and retained messages (#1560)
-* [Server] Fixed memory leak when old sessions are discarded (#1553)
-* [Server] When using MQTTv5 the reason code _NoMatchingSubscribers_ is returned when no client is subscribed to a published topic (#802)
-* [Server] Fix sending of duplicate messages with QoS > 0 when session is recovered and session is reused (#1546)
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