[#3068] add ChangeLog entry

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+2183.  [bug]           andrei
+       Fixed a bug where one of the commands that retrieve statistic
+       values sent to the kea-ctrl-agent would get an overflow error in
+       the response if the inquired statistic was intended to have a big
+       integer data type, and if the integer value would not be
+       representable on 64 bits. Affected statistics are "total-nas" and
+       "total-pds", and the bug only manifests if the inquired pool (or
+       the inquired subnet's aggregated pool space) is larger than /64
+       or larger in case of prefix delegation. Prior to this fix, the
+       command would still get an accurate response over unix socket.
+       (Gitlab #3068)
+
 Kea 2.5.2 (development) released on September 27, 2023
 
 2182.  [build]         razvan