Add a changelog entry.

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+Fixed: When accessing elements of Trilinos vectors that do not exist
+on the current MPI process (for example because a function *expects* a
+vector with ghost elements but got a completely distributed vector
+instead), deal.II tries to produce a reasonable error message pointing
+out the cause. But when using 64-bit indices, the logic that creates
+the error message was faulty, resulting in errors that were very hard
+to debug and not helpful at all. This is now fixed.
+<br>
+(Wolfgang Bangerth, 2024/04/17)