Upgrade to Commons FileUpload 1.4

Closes gh-18450

Author: snicoll

spring-boot-project/spring-boot-parent/pom.xml

@@ -59,7 +59,7 @@
 			<dependency>
 				<groupId>commons-fileupload</groupId>
 				<artifactId>commons-fileupload</artifactId>
-				<version>1.3.3</version>
+				<version>1.4</version>
 			</dependency>
 			<dependency>
 				<groupId>io.mockk</groupId>