Fix date in v25.4.0-alpha.1 (#20374)

Author: mikeCRL

src/current/_includes/releases/v25.4/v25.4.0-alpha.1.md

@@ -1,6 +1,6 @@
 ## v25.4.0-alpha.1
 
-Release Date: September 16, 2025
+Release Date: September 17, 2025
 
 {% include releases/new-release-downloads-docker-image.md release=include.release %}