Merge branch '2.18' into 2.19

Author: cowtowncoder

release-notes/VERSION-2.x

@@ -43,7 +43,7 @@ Active maintainers:
 #571: Unable to deserialize a pojo with IonStruct
  (reported, fix contributed by Josh C)
 
-2.18.4 (not yet released)
+2.18.4 (06-May-2025)
 
 #569: (ion) `IonParser` fails to parse some `long` values saying
   they are out of range when they are not