update dependency versions

pom.xml

@@ -7,7 +7,7 @@
     <groupId>de.garrus.maven</groupId>
     <artifactId>minecraft-server-plugin</artifactId>
     <packaging>maven-plugin</packaging>
-    <version>1.0.4-SNAPSHOT</version>
+    <version>1.0.3-SNAPSHOT</version>
     <name>minecraft-server-launcher</name>
     <description>Maven Plugin to launch an Server for Plugin Development.</description>
     <url>https://github.com/garrus-de/minecraft-server-plugin/</url>
@@ -44,11 +44,12 @@
         <maven-javadoc-plugin.version>3.1.1</maven-javadoc-plugin.version>
         <maven-gpg-plugin.verion>1.5</maven-gpg-plugin.verion>
         <nexus-staging-maven-plugin.version>1.6.7</nexus-staging-maven-plugin.version>
+        <maven.compiler.plugin>3.8.1</maven.compiler.plugin>
 
         <!--Dependency Versions-->
         <maven.version>3.6.0</maven.version>
         <maven.compiler.plugin>3.8.1</maven.compiler.plugin>
-        <gson.version>2.8.6</gson.version>
+        <gson.version>2.8.9</gson.version>
         <commons-io.version>2.7</commons-io.version>
     </properties>
 
@@ -196,4 +197,4 @@
         </profile>
     </profiles>
 
-</project>
+</project>