CHANGES: show a bug fix in main and 4.99. [skip ci]

Author: guyharris

CHANGES

@@ -54,6 +54,8 @@ DayOfTheWeek, Month DD, YYYY / The Tcpdump Group
 
 DayOfTheWeek, Month DD, YYYY / The Tcpdump Group
   Summary for 4.99.5 tcpdump release (so far!)
+    Fix:
+      Use the buffer stack for de-escaping PPP; fixes CVE-2024-2397.
     Refine protocol decoding for:
       Arista: Use the test .pcap file from pull request #955 (HwInfo).
       BGP: Fix an undefined behavior when it tries to parse a too-short packet.