Revert "Increase heap size in Surefire JVM"

This reverts commit e940bec.

Author: silvanocerza

pom.xml

@@ -156,9 +156,6 @@
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-surefire-plugin</artifactId>
                 <version>3.5.3</version>
-                <configuration>
-                    <argLine>-Xmx1024m</argLine>
-                </configuration>
             </plugin>
             <plugin>
                 <groupId>org.codehaus.mojo</groupId>