Update the org.realityforge.com.google.elemental2 dependency.

Author: realityforge

build.yaml

@@ -19,9 +19,9 @@ artifacts:
 
   jsinterop_base: com.google.jsinterop:base:jar:1.0.0-RC1
 
-  elemental2_core: org.realityforge.com.google.elemental2:elemental2-core:jar:1.0.0-b15-7a28038
-  elemental2_dom: org.realityforge.com.google.elemental2:elemental2-dom:jar:1.0.0-b15-7a28038
-  elemental2_promise: org.realityforge.com.google.elemental2:elemental2-promise:jar:1.0.0-b15-7a28038
+  elemental2_core: org.realityforge.com.google.elemental2:elemental2-core:jar:1.0.0-b16-6897368
+  elemental2_dom: org.realityforge.com.google.elemental2:elemental2-dom:jar:1.0.0-b16-6897368
+  elemental2_promise: org.realityforge.com.google.elemental2:elemental2-promise:jar:1.0.0-b16-6897368
 
   react4j_core: org.realityforge.react4j:react4j-core:jar:0.118
   react4j_dom: org.realityforge.react4j:react4j-dom:jar:0.118