Update supported_versions in vCluster Platform to extend 4.2 dates (#499)

Author: deniseschannon

platform/install/supported_versions.mdx

@@ -20,7 +20,7 @@ Any previous versions which are not on this list are no longer in any support wi
 
 | Release | Released | Active Support End Date | Maintenance Support End Date |
 |---|---|---|---|
-| v4.2 | December 17, 2024 | March 17, 2025 | June 17, 2025 |
+| v4.2 | December 17, 2024 | June 17, 2025 | September 17, 2025 |
 | v4.1 | November 12, 2024 | February 12, 2025 | May 12, 2025 |
 | v4.0 | October 15, 2024 | January 15, 2025 | April 15, 2025 |
 | v3.4| February 29, 2024 | April 1, 2025* | July 1, 2025 |