Add changelog

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+Changed: The concepts::is_vector_space_vector now also requires the vector
+class to provide a function `VectorType::get_mpi_communicator() -> MPI_Comm`,
+which returns the underlying MPI communicator or, if a sequential vector,
+@p MPI_COMM_SELF.
+<br>
+(Martin Kronbichler, David Wells, 2024/08/19)