5.3.x supports JDK21 as well

Spring-Framework-Versions.md

@@ -5,7 +5,7 @@ _This document describes new features, noteworthy changes, and provides guidance
 - 6.2.x is the upcoming feature branch (November 2024).
 - 6.1.x is the main production line as of November 2023.
 - 6.0.x is the previous production line, available since November 2022. This new framework generation comes with a JDK 17 and Jakarta EE 9 baseline.
-- 5.3.x is the final feature branch of the 5th generation, with long-term support provided on JDK 8, JDK 11, JDK 17 and the Java EE 8 level.
+- 5.3.x is the final feature branch of the 5th generation, with long-term support provided on JDK 8, JDK 11, JDK 17, JDK 21 and the Java EE 8 level.
 - _4.3.x reached its official EOL (end-of-life) on December 31st, 2020. No further maintenance and security patches are planned in that line._
 - _3.2.x reached its official EOL (end-of-life) on December 31st, 2016. No further maintenance and security patches are planned in that line._