Merge branch '2.19'

Author: cowtowncoder

release-notes/VERSION-2.x

@@ -35,6 +35,10 @@ Active maintainers:
 #547: (all) JSTEP-10: Unify testing structure/tools
  (contributed by Joo-Hyuk K)
 
+2.18.4 (not yet released)
+
+- (ion) Upgrade `ion-java` to 1.11.10 (from 1.11.9)
+
 2.18.3 (28-Feb-2025)
 
 #541: (cbor, protobuf, smile) `SmileParser.getValueAsString()` FIELD_NAME bug