Chore: replace explicit type with <> (as of JDK 7)

Author: dbmalkovsky

modules/flowable-engine/src/main/java/org/flowable/engine/impl/dynamic/AbstractDynamicStateManager.java

@@ -694,7 +694,7 @@ protected void safeDeleteSubProcessInstance(String processInstanceId, List<Execu
         //Confirm that all the subProcessExecutions are in the executions pool
         List<ExecutionEntity> subProcessExecutions = executionEntityManager.findChildExecutionsByProcessInstanceId(processInstanceId);
 
-        Set<String> executionIdsToMove = new HashSet<String>();
+        Set<String> executionIdsToMove = new HashSet<>();
         for (ExecutionEntity executionPoolItem : executionsPool) {
             executionIdsToMove.add(executionPoolItem.getId());
         }
@@ -1747,4 +1747,4 @@ protected ProcessDefinition resolveProcessDefinition(String processDefinitionKey
     private String printFlowElementIds(Collection<FlowElementMoveEntry> flowElements) {
         return flowElements.stream().map(FlowElementMoveEntry::getNewFlowElement).map(FlowElement::getId).collect(Collectors.joining(","));
     }
-}
+}