fix: 升级 spring-boot 版本，修复 RCE 漏洞

build.gradle

@@ -26,7 +26,7 @@ buildscript {
 
 plugins {
     id 'java'
-    id 'org.springframework.boot' version '2.5.11'
+    id 'org.springframework.boot' version '2.5.12'
     // https://plugins.gradle.org/plugin/io.spring.dependency-management
     id 'io.spring.dependency-management' version '1.0.11.RELEASE'
     // https://plugins.gradle.org/plugin/com.diffplug.spotless