Avoid unnecessary boxing/unboxing of primitives

Closes gh-25080

spring-context/src/main/java/org/springframework/scheduling/config/TaskExecutorFactoryBean.java

@@ -128,7 +128,7 @@ public class TaskExecutorFactoryBean implements
 					}
 				}
 				else {
-					Integer value = Integer.valueOf(this.poolSize);
+					int value = Integer.parseInt(this.poolSize);
 					corePoolSize = value;
 					maxPoolSize = value;
 				}