Upgrade staging plugin version to 1.7.0 (#1381)

Signed-off-by: JermaineHua <crazyhzm@apache.org>

Author: CrazyHZM

pom.xml

@@ -43,7 +43,7 @@
         <project.encoding>UTF-8</project.encoding>
         <project.build.encoding>UTF-8</project.build.encoding>
         <!--maven plugin-->
-        <maven.staging.plugin>1.6.13</maven.staging.plugin>
+        <maven.staging.plugin>1.7.0</maven.staging.plugin>
         <maven.gpg.pluign>1.6</maven.gpg.pluign>
         <flatten-maven-plugin.version>1.2.7</flatten-maven-plugin.version>
     </properties>