Add release date

Author: FDelporte

content/_index.md

@@ -8,7 +8,7 @@ title: Welcome to Pi4J
 **Pi4J moved to Java version 21!** Please [read this blog post for more info](/blog/2025/20250211-welcome-java-21/). 3.0.1 is the first release that requires Java 21 or newer.
 {{% /notice %}}
 
-**Latest release: V3.0.1 (2025-03-??, see [Release Notes](/about/release-notes/)).**
+**Latest release: V3.0.1 (2025-03-24, see [Release Notes](/about/release-notes/)).**
 
 This project is intended to provide **a friendly object-oriented I/O API and implementation libraries for Java Programmers** to access the **full I/O capabilities of the Raspberry Pi platform**. This project abstracts the low-level native integration and interrupt monitoring to enable Java programmers to **focus on implementing their application business logic**.