Update README

Update badge of Spring Boot to current version

Author: rainboyan

README.md

@@ -5,7 +5,7 @@
 
 [![Java Version](https://img.shields.io/badge/Java-17-blue?style=flat&logo=openjdk&color=437291)](https://docs.oracle.com/en/java/javase/17/)
 [![Groovy Version](https://img.shields.io/badge/Groovy-4.0.24-blue?logo=apachegroovy&style=flat&color=4298b8)](https://groovy-lang.org/releasenotes/groovy-4.0.html)
-[![Spring Boot Version](https://img.shields.io/badge/Spring_Boot-3.2.11-blue?logo=springboot&style=flat&color=6db33f)](https://github.com/spring-projects/spring-boot/releases/tag/v3.2.11)
+[![Spring Boot Version](https://img.shields.io/badge/Spring_Boot-3.2.12-blue?logo=springboot&style=flat&color=6db33f)](https://github.com/spring-projects/spring-boot/releases/tag/v3.2.12)
 
 Grace Framework
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