Upgrade exec maven plugin

Author: opatrascoiu

pom.xml

@@ -38,7 +38,7 @@
                     <plugin>
                         <groupId>org.codehaus.mojo</groupId>
                         <artifactId>exec-maven-plugin</artifactId>
-                        <version>3.1.0</version>
+                        <version>3.5.0</version>
                         <executions>
                             <execution>
                                 <id>python-test</id>