Added Parallel unit testing

Author: wimvelzeboer

sfdx-source/apex-common/test/classes/fflib_QueryFactoryTest.cls

@@ -24,7 +24,7 @@
  *  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 **/
 
-@isTest
+@isTest( isParallel = true )
 private class fflib_QueryFactoryTest {
 
 	@isTest