[maven-release-plugin] prepare release jackson-dataformat-xml-2.12.4

pom.xml

@@ -13,7 +13,7 @@
   </parent>
   <groupId>com.fasterxml.jackson.dataformat</groupId>
   <artifactId>jackson-dataformat-xml</artifactId>
-  <version>2.12.4-SNAPSHOT</version>
+  <version>2.12.4</version>
   <name>Jackson-dataformat-XML</name>
   <packaging>bundle</packaging>
   <description>Data format extension for Jackson to offer
@@ -24,7 +24,7 @@ alternative support for serializing POJOs as XML and deserializing XML as pojos.
     <connection>scm:git:git@github.com:FasterXML/jackson-dataformat-xml.git</connection>
     <developerConnection>scm:git:git@github.com:FasterXML/jackson-dataformat-xml.git</developerConnection>
     <url>http://github.com/FasterXML/jackson-dataformat-xml</url>    
-    <tag>HEAD</tag>
+    <tag>jackson-dataformat-xml-2.12.4</tag>
   </scm>
   <properties>
     <packageVersion.dir>com/fasterxml/jackson/dataformat/xml</packageVersion.dir>