Do not list Gradle plugin twice

Author: centic9

build.gradle

@@ -17,7 +17,6 @@ apply plugin: 'java'
 apply plugin: 'de.thetaphi.forbiddenapis'
 apply plugin: 'jacoco'
 apply plugin: 'signing'
-apply plugin: 'io.codearte.nexus-staging'
 
 sourceCompatibility = JavaVersion.VERSION_11
 group = 'org.dstadler'