Update release date for version 11.6.4

Author: MarkvanMents

content/en/docs/releasenotes/studio-pro/11/11.6.md

@@ -8,7 +8,7 @@ mts: true
 
 ## 11.6.4 {#1164}
 
-**Release date: February ____, 2026**
+**Release date: March 4, 2026**
 
 {{% button color="info" href="https://marketplace.mendix.com/link/studiopro/11.6.4" text="Go to Marketplace" title="Download version 11.6.4 from the Marketplace" %}}