[maven-release-plugin] prepare release maven-site-plugin-3.12.1

pom.xml

@@ -30,7 +30,7 @@ under the License.
   </parent>
 
   <artifactId>maven-site-plugin</artifactId>
-  <version>3.12.1-SNAPSHOT</version>
+  <version>3.12.1</version>
   <packaging>maven-plugin</packaging>
 
   <name>Apache Maven Site Plugin</name>
@@ -177,7 +177,7 @@ under the License.
     <connection>scm:git:https://gitbox.apache.org/repos/asf/maven-site-plugin.git</connection>
     <developerConnection>scm:git:https://gitbox.apache.org/repos/asf/maven-site-plugin.git</developerConnection>
     <url>https://github.com/apache/maven-site-plugin/tree/${project.scm.tag}</url>
-    <tag>HEAD</tag>
+    <tag>maven-site-plugin-3.12.1</tag>
   </scm>
   <issueManagement>
     <system>JIRA</system>
@@ -212,7 +212,7 @@ under the License.
     <projectInfoReportsPluginVersion>3.2.2</projectInfoReportsPluginVersion>
     <surefirePluginVersion>2.22.2</surefirePluginVersion>
     <surefire.version>2.22.2</surefire.version>
-    <project.build.outputTimestamp>2022-04-16T21:02:16Z</project.build.outputTimestamp>
+    <project.build.outputTimestamp>2022-07-31T18:58:29Z</project.build.outputTimestamp>
 
   </properties>