Upgrade to Spring 6 and Spring Boot 3.

See #654

redis/reactive/src/test/java/example/springdata/redis/RedisTestConfiguration.java

@@ -15,7 +15,7 @@
  */
 package example.springdata.redis;
 
-import javax.annotation.PreDestroy;
+import jakarta.annotation.PreDestroy;
 
 import org.springframework.boot.autoconfigure.SpringBootApplication;
 import org.springframework.context.annotation.Bean;