Remove deploy execution in Nexus Staging Plugin

This would produce snapshots that Gradle could not consume,
because the build number in the maven-metadata.xml file and
the produced binaries wouldn't be in sync.
Maven is able to consume those, but not Gradle.

Author: acogoluegnes

pom.xml

@@ -102,7 +102,7 @@
 
     <!-- to sign artifacts when releasing -->
     <gpg.keyname>6026DFCA</gpg.keyname>
-    <nexus-staging-maven-plugin.version>1.6.4</nexus-staging-maven-plugin.version>
+    <nexus-staging-maven-plugin.version>1.6.8</nexus-staging-maven-plugin.version>
   </properties>
 
   <profiles>
@@ -456,15 +456,6 @@
             <groupId>org.sonatype.plugins</groupId>
             <artifactId>nexus-staging-maven-plugin</artifactId>
             <version>${nexus-staging-maven-plugin.version}</version>
-            <executions>
-              <execution>
-                <id>default-deploy</id>
-                <phase>deploy</phase>
-                <goals>
-                  <goal>deploy</goal>
-                </goals>
-              </execution>
-            </executions>
             <configuration>
               <serverId>ossrh</serverId>
               <nexusUrl>https://oss.sonatype.org/</nexusUrl>