Update dependency org.sonatype.plugins:nexus-staging-maven-plugin to v1.6.12

Author: renovate-bot

pom.xml

@@ -55,7 +55,7 @@
 		<maven-gpg-plugin.version>1.6</maven-gpg-plugin.version>
 		<maven-source-plugin.version>3.2.1</maven-source-plugin.version>
 		<maven-javadoc-plugin.version>3.2.0</maven-javadoc-plugin.version>
-		<nexus-staging-maven-plugin.version>1.6.8</nexus-staging-maven-plugin.version>
+		<nexus-staging-maven-plugin.version>1.6.12</nexus-staging-maven-plugin.version>
     </properties>
 
 	<profiles>