update platform info: minimum version from 2024 is AEM 6.5.17, Java 2…

…1 supported as well

public_site/src/site/markdown/platforms.md

@@ -2,12 +2,13 @@
 
 The wcm.io modules support the following platforms:
 
-* AEM Version 6.5.7+, AEM Cloud Service
+* AEM Version 6.5.17+, AEM Cloud Service
 * Apache Sling, Apache Felix an others: Versions as included in the corresponding AEM version
-* Java 11 and Java 17
+* Java 11, Java 17 and Java 21
 
 Support of historical versions:
 
+* wcm.io releases up to December 2023 also supported AEM 6.5.7+
 * wcm.io releases up to December 2022 also supported Oracle Java 8.
 * wcm.io releases up to December 2021 also supported AEM 6.4.
 * wcm.io releases up to December 2020 also supported AEM 6.3.