[maven-release-plugin] prepare release 4.2.1

pom.xml

@@ -3,7 +3,7 @@
 
   <groupId>com.github.frameworkium</groupId>
   <artifactId>frameworkium-core</artifactId>
-  <version>4.2.1-SNAPSHOT</version>
+  <version>4.2.1</version>
   <name>frameworkium-core</name>
   <description>
     Frameworkium core code.
@@ -25,7 +25,7 @@
     <connection>scm:git:[email protected]:Frameworkium/frameworkium-core.git</connection>
     <url>https://github.com/Frameworkium/frameworkium-core</url>
     <developerConnection>scm:git:[email protected]:Frameworkium/frameworkium-core.git</developerConnection>
-    <tag>HEAD</tag>
+    <tag>4.2.1</tag>
   </scm>
   <issueManagement>
     <system>github issues</system>