update maven badge

Author: alexcheng1982

README.md

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 # Agentic Patterns
 
 [![build](https://github.com/JavaAIDev/agentic-patterns/actions/workflows/build.yaml/badge.svg)](https://github.com/JavaAIDev/agentic-patterns/actions/workflows/build.yaml)
-![Maven Central Version](https://img.shields.io/maven-central/v/com.javaaidev/agentic-patterns)
+![Maven Central Version](https://img.shields.io/maven-central/v/com.javaaidev.agenticpatterns/agentic-patterns)
 
 Reference implementation of [Agentic Patterns](https://javaaidev.com/docs/agentic-patterns/intro/)