Update CI to use Java 17 and document requirements in README

Co-authored-by: nomeguy <85475922+nomeguy@users.noreply.github.com>

Author: Copilot

.github/workflows/maven-ci.yml

@@ -26,10 +26,10 @@ jobs:
         with:
           fetch-depth: '0'
 
-      - name: Set up JDK 1.8
+      - name: Set up JDK 17
         uses: actions/setup-java@v1
         with:
-          java-version: 1.8
+          java-version: 17
           server-username: OSSRH_JIRA_USERNAME
           server-password: OSSRH_JIRA_PASSWORD
           gpg-private-key: ${{ secrets.GPG_PRIVATE_KEY }}

README.md

@@ -4,14 +4,20 @@
 [![GitHub Actions](https://github.com/jcasbin/casbin-spring-boot-starter/workflows/build/badge.svg)](https://github.com/jcasbin/casbin-spring-boot-starter/actions)
 [![Maven Central](https://img.shields.io/maven-central/v/org.casbin/casbin-spring-boot-starter.svg?style=flat-square&color=brightgreen)](https://mvnrepository.com/artifact/org.casbin/casbin-spring-boot-starter/latest)
 [![License](https://img.shields.io/github/license/jcasbin/casbin-spring-boot-starter.svg?style=flat-square&color=blue)](http://www.apache.org/licenses/LICENSE-2.0.txt)
-[![SpringBootVersion](https://img.shields.io/badge/SpringBoot-2.7.12-heightgreen.svg?style=flat-square)](https://spring.io/projects/spring-boot)
+[![SpringBootVersion](https://img.shields.io/badge/SpringBoot-4.0.0-brightgreen.svg?style=flat-square)](https://spring.io/projects/spring-boot)
+[![JavaVersion](https://img.shields.io/badge/Java-17+-blue.svg?style=flat-square)](https://openjdk.org/)
 [![CasbinVersion](https://img.shields.io/badge/jCasbin-1.81.0-heightgreen.svg?style=flat-square)](https://casbin.org)
 
 [![](https://raw.githubusercontent.com/casbin/jcasbin/master/casbin-logo.png)](https://casbin.org)
 
 Casbin Spring Boot Starter is designed to help you easily integrate [jCasbin](https://github.com/casbin/jcasbin) into
 your Spring Boot project.
 
+## Requirements
+
+- Java 17 or higher
+- Spring Boot 4.0.0 or higher
+
 ## how to use
 
 1. Add ```casbin-spring-boot-starter``` to the Spring Boot project.