reverting to poms from 2.12

pom.xml

@@ -3,7 +3,7 @@
     <modelVersion>4.0.0</modelVersion>
     <groupId>org.mustangproject</groupId>
     <artifactId>core</artifactId>
-    <version>2.13.0-SNAPSHOT</version>
+    <version>2.12.0-SNAPSHOT</version>
     <packaging>pom</packaging>
     <name>Mustang</name>
 
@@ -63,7 +63,8 @@
                 <artifactId>maven-deploy-plugin</artifactId>
                 <version>3.0.0-M1</version>
                 <configuration>
-                    <altDeploymentRepository>internal.repo::default::file://${project.build.directory}/mvn-repo</altDeploymentRepository>
+                    <altDeploymentRepository>internal.repo::default::file://${project.build.directory}/mvn-repo
+                    </altDeploymentRepository>
                 </configuration>
             </plugin>
 
@@ -81,7 +82,6 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-surefire-plugin</artifactId>
-                <version>3.3.1</version>
                 <configuration>
                     <runOrder>alphabetical</runOrder>
                 </configuration>
@@ -90,6 +90,9 @@
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-source-plugin</artifactId>
                 <version>3.2.1</version>
+                <configuration>
+                    <encoding>UTF-8</encoding>
+                </configuration>
                 <executions>
                     <execution>
                         <id>attach-javadoc</id>
@@ -115,6 +118,7 @@
         <github.global.server>github</github.global.server>
         <additionalparam>-Xdoclint:none</additionalparam>
         <!-- Skip error check for javadoc -->
+        <maven.compiler.compilerVersion>11</maven.compiler.compilerVersion>
         <maven.compiler.source>11</maven.compiler.source>
         <maven.compiler.target>11</maven.compiler.target>
         <maven.deploy.skip>true</maven.deploy.skip><!-- prevent this to be deployed to maven central as "core",