build(deps): update dependency org.sonatype.plugins:nexus-staging-maven-plugin to v1.6.12 (googleapis#1180)

Author: renovate-bot

samples/pom.xml

@@ -47,7 +47,7 @@
       <plugin>
         <groupId>org.sonatype.plugins</groupId>
         <artifactId>nexus-staging-maven-plugin</artifactId>
-        <version>1.6.11</version>
+        <version>1.6.12</version>
         <configuration>
           <skipNexusStagingDeployMojo>true</skipNexusStagingDeployMojo>
         </configuration>