update version

Author: rieckpil

README.md

@@ -2,7 +2,7 @@
 
 [![Masterclass](https://rieckpil.de/wp-content/uploads/2020/09/testing-spring-boot-applications-masterclass-course-logo.png)](https://rieckpil.de/testing-spring-boot-applications-masterclass/)
 
-[![](https://img.shields.io/badge/Spring%20Boot%20Version-3.5.0-orange)](/pom.xml)
+[![](https://img.shields.io/badge/Spring%20Boot%20Version-4.0.2-orange)](/pom.xml)
 [![](https://img.shields.io/badge/Java%20Version-21-orange)](/pom.xml)
 [![](https://img.shields.io/badge/Enroll-Now-orange)](https://rieckpil.de/testing-spring-boot-applications-masterclass/)