[SCB-2529] use parent maven plugin version (#2992)

diff --git a/demo/pom.xml b/demo/pom.xml
index 36ae813..19a4be3 100644
--- a/demo/pom.xml
+++ b/demo/pom.xml
@@ -146,14 +146,12 @@
         </plugin>
         <plugin>
           <artifactId>maven-deploy-plugin</artifactId>
-          <version>2.8.2</version>
           <configuration>
             <skip>true</skip>
           </configuration>
         </plugin>
         <plugin>
           <artifactId>maven-install-plugin</artifactId>
-          <version>2.5.2</version>
           <configuration>
             <skip>false</skip>
           </configuration>
@@ -161,7 +159,6 @@
         <plugin>
           <groupId>org.apache.maven.plugins</groupId>
           <artifactId>maven-jar-plugin</artifactId>
-          <version>2.6</version>
           <executions>
             <execution>
               <id>assembly</id>
diff --git a/integration-tests/pom.xml b/integration-tests/pom.xml
index b48301f..7d16333 100644
--- a/integration-tests/pom.xml
+++ b/integration-tests/pom.xml
@@ -165,7 +165,6 @@
           <plugin>
             <groupId>org.apache.maven.plugins</groupId>
             <artifactId>maven-jar-plugin</artifactId>
-            <version>3.1.0</version>
             <executions>
               <execution>
                 <id>default-jar</id>
diff --git a/parents/default/pom.xml b/parents/default/pom.xml
index efc1340..c521be3 100644
--- a/parents/default/pom.xml
+++ b/parents/default/pom.xml
@@ -107,7 +107,6 @@
     <plugins>
       <plugin>
         <artifactId>maven-source-plugin</artifactId>
-        <version>2.4</version>
         <executions>
           <execution>
             <id>attach-sources</id>