Remove unused dependencies (#489)

pom.xml

@@ -109,11 +109,6 @@
         <artifactId>plexus-archiver</artifactId>
         <version>4.7.1</version>
       </dependency>
-      <dependency>
-        <groupId>org.codehaus.plexus</groupId>
-        <artifactId>plexus-container-default</artifactId>
-        <version>${plexus-containers.version}</version>
-      </dependency>
       <dependency>
         <groupId>org.codehaus.plexus</groupId>
         <artifactId>plexus-io</artifactId>
@@ -179,18 +174,6 @@
       <artifactId>maven-archiver</artifactId>
       <version>3.6.0</version>
     </dependency>
-    <!-- for copy-dependency-plugins -->
-    <dependency>
-      <groupId>org.apache.maven.plugins</groupId>
-      <artifactId>maven-dependency-plugin</artifactId>
-      <version>3.5.0</version>
-      <exclusions>
-        <exclusion>
-          <groupId>asm</groupId>
-          <artifactId>asm</artifactId>
-        </exclusion>
-      </exclusions>
-    </dependency>
     <dependency>
       <groupId>org.apache.maven.shared</groupId>
       <artifactId>maven-artifact-transfer</artifactId>
@@ -211,11 +194,6 @@
       <artifactId>plexus-component-annotations</artifactId>
       <version>${plexus-containers.version}</version>
     </dependency>
-    <dependency>
-      <groupId>org.codehaus.plexus</groupId>
-      <artifactId>plexus-interactivity-api</artifactId>
-      <version>1.1</version>
-    </dependency>
     <dependency>
       <groupId>org.codehaus.plexus</groupId>
       <artifactId>plexus-utils</artifactId>
@@ -310,6 +288,12 @@
       <!-- annotations are not needed for plugin execution, so exclude using provided scope -->
       <scope>provided</scope>
     </dependency>
+    <dependency>
+      <groupId>junit</groupId>
+      <artifactId>junit</artifactId>
+      <version>4.13.2</version>
+      <scope>test</scope>
+    </dependency>
   </dependencies>
 
   <repositories>