Add a changelog entry.

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+Removed: The Tensor<0,dim> template had functions `begin_raw()` and
+`end_raw()`, which had been deprecated for a couple of releases
+already. They have been removed now.
+<br>
+Furthermore, the corresponding functions for the general
+Tensor<rank,dim> template have been deprecated. They can still be used
+for the time being, but only for the specific case `rank==1`. This is
+because the underlying assumption of these functions is that tensors
+store their elements in memory in a contiguous fashion, but that is
+only true for the case `rank==1`. Similarly, the `make_array_view()`
+function that takes tensors as input has been marked as deprecated,
+and can only be used for rank-1 tensors from now on.
+<br>
+(Wolfgang Bangerth, 2024/03/26)