Fix the nuget min dependecies for the Plugin dlls

[indualagarsamy]

Currently for ServiceControl.Beta0007.1, the nuget min dependencies are set to 4.4.2.
While for SagaAudit it might be right, it needs to be set to 4.0.x for the heartbeat and custom checks so that it can be applied to exisiting 4.x endpoints.

Current min dependency:

<dependencies>
      <dependency id="NServiceBus" version="4.4.2.0" />
      <dependency id="NServiceBus.Interfaces" version="4.4.2.0" />
    </dependencies>

[andreasohlund]

Fixed by @johnsimons in 897de1f