Add a changelog entry.

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+Deprecated: The DoFTools::map_dofs_to_support_points() function family
+had functions that returned what they computed via a non-const
+reference argument `support_points` of type `std::map`. These
+overloads are now deprecated and replaced by functions that return the
+map via a regular `return` value.
+<br>
+(Wolfgang Bangerth, 2023/04/07)