[maven-release-plugin] prepare release v3.12.1

Author: pivotal-rabbitmq-ci

pom.xml

@@ -3,7 +3,7 @@
   <modelVersion>4.0.0</modelVersion>
   <groupId>com.rabbitmq</groupId>
   <artifactId>http-client</artifactId>
-  <version>3.13.0-SNAPSHOT</version>
+  <version>3.12.1</version>
 
   <name>Hop</name>
   <description>Java Client for the RabbitMQ HTTP API</description>
@@ -31,7 +31,7 @@
     <connection>scm:git:git://github.com/rabbitmq/hop.git</connection>
     <developerConnection>scm:git:git@github.com:rabbitmq/hop.git
     </developerConnection>
-    <tag>HEAD</tag>
+    <tag>v3.12.1</tag>
   </scm>
 
   <properties>