Add a changelog entry for the alignment of tensors.

diff --git a/doc/news/changes/minor/20240323Bangerth b/doc/news/changes/minor/20240323Bangerth
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+Changed: The Tensor class now has an alignment greater than what the
+compiler would automatically choose to enable more efficient memory
+operations on these objects.
+<br>
+(Wolfgang Bangerth, 2024/03/23)