Upgrade to Mockito 3.1.0

Closes gh-18496

Author: wilkinsona

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

@@ -153,7 +153,7 @@
 		<mariadb.version>2.4.4</mariadb.version>
 		<micrometer.version>1.3.0</micrometer.version>
 		<mimepull.version>1.9.11</mimepull.version>
-		<mockito.version>3.0.0</mockito.version>
+		<mockito.version>3.1.0</mockito.version>
 		<mongo-driver-reactivestreams.version>1.12.0</mongo-driver-reactivestreams.version>
 		<mongodb.version>3.11.0</mongodb.version>
 		<mssql-jdbc.version>7.4.1.jre8</mssql-jdbc.version>