bump springboot to 4.0.0-RC1 (#8165)

Author: ZheSun88

pom.xml

@@ -18,7 +18,7 @@
     <properties>
         <maven.compiler.source>21</maven.compiler.source>
         <maven.compiler.target>21</maven.compiler.target>
-        <spring.boot.version>4.0.0-M3</spring.boot.version>
+        <spring.boot.version>4.0.0-RC1</spring.boot.version>
         <jakarta.ee.version>11.0.0</jakarta.ee.version>
         <junit.jupiter.version>5.9.1</junit.jupiter.version>
         <jetty.version>12.0.22</jetty.version>