bug: `Command.Builder<C>.senderType` must narrow the sender type down

[DanikVitek]

As can be seen from this line:

cloud/cloud-kotlin/cloud-kotlin-extensions/src/main/kotlin/org/incendo/cloud/kotlin/extension/CommandBuildingExtensions.kt

Line 81 in 3c83f9a

public fun <C : Any> Command.Builder<C>.senderType(type: KClass<out C>): Command.Builder<C> =

The type is not being narrowed, even though the Java version of the method for both Class and TypeToken overloads does narrow it down. This could be fixed in the following way:

public fun <C : Any, N : C> Command.Builder<C>.senderType(type: KClass<out N>): Command.Builder<N> =
    senderType(type.java)