DO NOT MERGE. Update 25.4 branch version.

Test: none
Change-Id: I6edfb83647a5db97f32c9e1493fe39b0413aaac5
diff --git a/build.gradle b/build.gradle
index 8feee6d..59ef734 100644
--- a/build.gradle
+++ b/build.gradle
@@ -40,8 +40,8 @@
     doclava project(':doclava')
 }
 
-ext.supportVersion = '25.2.0-SNAPSHOT'
-ext.extraVersion = 41
+ext.supportVersion = '25.4.0-SNAPSHOT'
+ext.extraVersion = 43
 ext.supportRepoOut = ''
 ext.buildNumber = Integer.toString(ext.extraVersion)