XWIKI-21543: Upgrade to diffDOM 4.2.8

(cherry picked from commit 195b10a0)

xwiki-platform-core/xwiki-platform-realtime/xwiki-platform-realtime-wysiwyg/xwiki-platform-realtime-wysiwyg-ui/src/main/resources/XWiki/Realtime/WysiwygEditor.xml

@@ -771,7 +771,7 @@
     </property>
     <property>
       <parameters>id=diff-dom
-path=$services.webjars.url('org.webjars.bower:diff-dom', 'browser/diffDOM.js')
+path=$services.webjars.url('org.webjars.npm:diff-dom', 'browser/diffDOM.js')
 exports=diffDOM</parameters>
     </property>
     <property>

xwiki-platform-core/xwiki-platform-realtime/xwiki-platform-realtime-wysiwyg/xwiki-platform-realtime-wysiwyg-webjar/pom.xml

@@ -51,9 +51,9 @@
       <artifactId>jquery</artifactId>
     </dependency>
     <dependency>
-      <groupId>org.webjars.bower</groupId>
+      <groupId>org.webjars.npm</groupId>
       <artifactId>diff-dom</artifactId>
-      <version>4.2.3</version>
+      <version>4.2.8</version>
       <scope>runtime</scope>
     </dependency>
     <dependency>