INT-4221: Properly use Spring's Assert class

JIRA: https://jira.spring.io/browse/INT-4221

* Upgrade to those versions of Spring project dependencies which potentially will provide similar fix

**Cherry-pick to 4.3.x**

spring-integration-sftp/src/main/java/org/springframework/integration/sftp/session/SftpFileInfo.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2012 the original author or authors.
+ * Copyright 2002-2017 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -37,7 +37,7 @@ public class SftpFileInfo extends AbstractFileInfo<LsEntry> {
 
 
 	public SftpFileInfo(LsEntry lsEntry) {
-		Assert.notNull("LsEntry must not be null");
+		Assert.notNull(lsEntry, "'lsEntry' must not be null");
 		this.lsEntry = lsEntry;
 		this.attrs = lsEntry.getAttrs();
 	}