HADOOP-16275. Upgrade Mockito to the latest version. Contributed by kevin su.

Signed-off-by: Wei-Chiu Chuang <weichiu@apache.org>

LICENSE.txt

@@ -667,7 +667,7 @@ spin.js v2.3.2
 Azure Data Lake Store - Java client SDK 2.0.11
 JCodings 1.0.8
 Joni 2.1.2
-Mockito 2.23.4
+Mockito 2.28.2
 JUL to SLF4J bridge 1.7.25
 SLF4J API Module 1.7.25
 SLF4J LOG4J-12 Binding 1.7.25

hadoop-project/pom.xml

@@ -1099,7 +1099,7 @@
       <dependency>
         <groupId>org.mockito</groupId>
         <artifactId>mockito-core</artifactId>
-        <version>2.23.4</version>
+        <version>2.28.2</version>
       </dependency>
       <dependency>
         <groupId>org.mockito</groupId>