Add a changelog entry.

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+Deprecated: The Utilities::MPI::ConsensusAlgorithms::Payload base
+class has been deprecated. It used to serve as an interface class for
+the algorithms in namespace Utilities::MPI::ConsensusAlgorithms, but
+we have since come up with ways of formulating these algorithms in
+terms of function objects that are more flexible than the base
+class/virtual function interface now deprecated.
+<br>
+(Wolfgang Bangerth, 2024/11/12)