Update README.md

Author: KTC-YoheiMiyashita

README.md

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 Spring Batch3 Starter - Accelerate Your Spring Boot 3 Batch Development🚀
 =============================
 [![Github](https://img.shields.io/github/stars/KTC-YoheiMiyashita/SpringBoot3BatchStarter?logo=github&style=flat)](https://github.com/KTC-YoheiMiyashita/SpringBoot3BatchStarter)
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@@ -69,7 +69,7 @@ This repository serves as a Spring Batch Starter Kit, specifically tailored for
 
 ## 🚀 Getting Started / はじめに
 ### Prerequisites
-- Java 17+ for Spring Boot 3.
+- Java 21+ for Spring Boot 3.
 - Docker for setting up the MySQL environment.
 
 ### 1.	Clone the repository