TIKA-4379: update exec-maven-plugin

Author: THausherr

tika-server/tika-server-core/pom.xml

@@ -284,7 +284,7 @@
           <plugin>
             <groupId>org.codehaus.mojo</groupId>
             <artifactId>exec-maven-plugin</artifactId>
-            <version>3.4.1</version>
+            <version>{maven.exec.version}</version>
             <executions>
               <execution>
                 <phase>test</phase>