Add change note

Author: lcartey

change_notes/2023-09-28-a7-3-1-updates.md

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+ * `A7-3-1` - `HiddenInheritedNonOverridableMemberFunction.ql`:
+   - Reduce duplication by reporting only a single location for each declaration of a problematic element.
+   - Reduce duplication when reporting the hidden function by reporting only one declaration entry.
+   - Improve performance by eliminating a number of bad join orders.
+   - Fix false positives where the using declaration occurred after the function declaration.
+   - Exclude special member functions, which cannot be inherited.