Update dependency org.codehaus.mojo:exec-maven-plugin to v3

Author: renovate[bot]

pom.xml

@@ -447,7 +447,7 @@ software.
           <plugin>
             <groupId>org.codehaus.mojo</groupId>
             <artifactId>exec-maven-plugin</artifactId>
-            <version>1.6.0</version>
+            <version>3.6.2</version>
             <executions>
               <execution>
                 <id>start-server</id>