Add a changelog entry.

geodynamics · Nov 28, 2023 · 0b11ce4 · 0b11ce4
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+Changed: The interface
+Postprocess::VisualizationPostprocessors::CellDataVectorCreator::execute()
+used to return an object of type
+`std::pair<std::string, Vector<float>*>` where the second part is just a
+raw pointer. This has been changed (incompatibly) to
+`std::pair<std::string, std::unique_ptr<Vector<float>>>` to avoid the use
+of raw pointers and ensure that memory de-allocation happens automatically.
+<br>
+(Wolfgang Bangerth, 2023/11/28)