Auto-release all clients when publishing with Maven

This property is covered in [the
docs](https://central.sonatype.org/publish/publish-maven/#nexus-staging-maven-plugin-for-deployment-and-release).
It also allows for a manual review opportunity... but given that we don't do
that, and that we test first, let's not go there.

clients/pom.xml

@@ -86,6 +86,7 @@
         <configuration>
           <serverId>ossrh</serverId>
           <nexusUrl>https://s01.oss.sonatype.org/</nexusUrl>
+          <autoReleaseAfterClose>true</autoReleaseAfterClose>
         </configuration>
       </plugin>
     </plugins>