Remove pom change

Author: yoquinjo

jvm-packages/xgboost4j/pom.xml

@@ -69,7 +69,7 @@
                           <goal>exec</goal>
                       </goals>
                       <configuration>
-                          <executable>python3</executable>
+                          <executable>python</executable>
                           <arguments>
                             <argument>create_jni.py</argument>
                             <argument>--log-capi-invocation</argument>