fix: use correct maven-war-plugin version

diff --git a/src/it/skinny-wars-javaee5/war-module1/pom.xml b/src/it/skinny-wars-javaee5/war-module1/pom.xml
index c093103..4512c17 100644
--- a/src/it/skinny-wars-javaee5/war-module1/pom.xml
+++ b/src/it/skinny-wars-javaee5/war-module1/pom.xml
@@ -40,6 +40,7 @@
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-war-plugin</artifactId>
+        <version>@mavenWarPluginVersion@</version>
         <configuration>
           <archive>
             <manifest>
diff --git a/src/it/skinny-wars-javaee5/war-module2/pom.xml b/src/it/skinny-wars-javaee5/war-module2/pom.xml
index 5d2fd3c..f98dc73 100644
--- a/src/it/skinny-wars-javaee5/war-module2/pom.xml
+++ b/src/it/skinny-wars-javaee5/war-module2/pom.xml
@@ -34,4 +34,15 @@
       <version>2.6</version>
     </dependency>
   </dependencies>
+
+  <build>
+    <plugins>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-war-plugin</artifactId>
+        <version>@mavenWarPluginVersion@</version>
+      </plugin>
+    </plugins>
+  </build>
+
 </project>
diff --git a/src/it/skinny-wars-javaee5/war-module3/pom.xml b/src/it/skinny-wars-javaee5/war-module3/pom.xml
index 8041f63..71dc670 100644
--- a/src/it/skinny-wars-javaee5/war-module3/pom.xml
+++ b/src/it/skinny-wars-javaee5/war-module3/pom.xml
@@ -40,6 +40,7 @@
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-war-plugin</artifactId>
+        <version>@mavenWarPluginVersion@</version>
         <configuration>
           <archive>
             <manifest>