Add a changelog entry.

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+Changed: The Quadrature class used to have a constructor that took an
+integer argument. This was error-prone because it was easy to accidentally
+write
+@code
+  Quadrature<dim> quadrature(3);
+@endcode
+where
+@code
+  QGauss<dim> quadrature(3);
+@endcode
+was meant. As a consequence, this constructor has been removed from the `public`
+interface of the class.
+<br>
+(Wolfgang Bangerth, 2024/05/13)