Update content/en/docs/refguide/installation/system-requirements.md

Co-authored-by: Mark van Ments <35492184+MarkvanMents@users.noreply.github.com>

Author: Yiyun333

content/en/docs/refguide/installation/system-requirements.md

@@ -298,7 +298,7 @@ Developing native mobile apps with Mendix comes with special requirements explai
 MxBuild is a Windows and Linux command-line tool that can be used to build a Mendix Deployment Package. For more information, see [MxBuild](/refguide/mxbuild/).
 
 * .NET 8
-* JDK 11
+* JDK 21
 
 ## mx Command-Line Tool {#mxtool}