Don't specify spring-graalvm-native version anymore

That will use the latest released to avoid dependency cycles

samples/kofu-petclinic-jdbc/pom.xml

@@ -31,16 +31,10 @@
 
     <dependencies>
 
-        <dependency>
-            <groupId>org.springframework.experimental</groupId>
-            <artifactId>spring-graalvm-native</artifactId>
-            <version>0.8.0</version>
-        </dependency>
-
         <dependency>
             <groupId>org.springframework.fu</groupId>
             <artifactId>spring-fu-kofu</artifactId>
-            <version>0.4.1-SNAPSHOT</version>
+            <version>0.4.1</version>
         </dependency>
 
         <!-- Spring and Spring Boot dependencies -->