Add a changelog entry.

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+Deprecated: The entire LocalIntegrators namespace has been
+deprecated. The namespace represents an effort at making integration
+simpler by providing a library of terms that appear frequently in
+equations. But this only made the simple case simple -- everything
+that exceeded the simplest case still needed to be done by hand, and
+using these pre-built integrators did not help teaching how to do
+that. As a consequence, these pre-built integrators will be removed in
+a future version of the library.
+<br>
+(Wolfgang Bangerth, 2023/07/03)