Update spring core to v6

Author: renovate[bot]

spring-example/pom.xml

@@ -9,7 +9,7 @@
     <artifactId>spring-example</artifactId>
 
     <properties>
-        <spring.version>5.3.25</spring.version>
+        <spring.version>6.0.6</spring.version>
         <slf4j.version>2.0.6</slf4j.version>
     </properties>