Updates exec-maven-plugin version #145

Hopefully this will solve the build issue on Jenkins related to not
being able to get dependencies for this old version.

query/plugins/org.eclipse.viatra.query.patternlanguage.emf/pom.xml

@@ -54,7 +54,6 @@
             <plugin>
                 <groupId>org.codehaus.mojo</groupId>
                 <artifactId>exec-maven-plugin</artifactId>
-                <version>1.6.0</version>
                 <executions>
                     <execution>
                         <id>mwe2Launcher</id>

query/plugins/org.eclipse.viatra.query.tooling.generator.model/pom.xml

@@ -49,7 +49,6 @@
 			<plugin>
 				<groupId>org.codehaus.mojo</groupId>
 				<artifactId>exec-maven-plugin</artifactId>
-				<version>1.6.0</version>
 				<executions>
 					<execution>
 						<id>mwe2Launcher</id>

releng/org.eclipse.viatra.parent/pom.xml

@@ -11,7 +11,7 @@
 	<version>2.9.0-SNAPSHOT</version>
 	<packaging>pom</packaging>
 	<properties>
-		<tycho.version>4.0.4</tycho.version>
+		<tycho.version>4.0.6</tycho.version>
 		<tycho.scmUrl>scm:git:git://git.eclipse.org/gitroot/viatra/org.eclipse.viatra.git</tycho.scmUrl>
 		<eclipse.bugzillaUrl>https://bugs.eclipse.org/bugs/enter_bug.cgi?product=viatra</eclipse.bugzillaUrl>
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
@@ -249,6 +249,11 @@
 						<executionEnvironment>JavaSE-11</executionEnvironment>
 					</configuration>
 				</plugin>
+				<plugin>
+                    <groupId>org.codehaus.mojo</groupId>
+                    <artifactId>exec-maven-plugin</artifactId>
+                    <version>3.2.0</version>
+                </plugin>
 			</plugins>
 		</pluginManagement>
 	</build>