Upgrade to Mockito 3.0.0

Closes gh-17803

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

@@ -149,7 +149,7 @@
 		<mariadb.version>2.4.3</mariadb.version>
 		<micrometer.version>1.2.0</micrometer.version>
 		<mimepull.version>1.9.11</mimepull.version>
-		<mockito.version>2.28.2</mockito.version>
+		<mockito.version>3.0.0</mockito.version>
 		<mongo-driver-reactivestreams.version>1.12.0-rc0</mongo-driver-reactivestreams.version>
 		<mongodb.version>3.11.0-rc0</mongodb.version>
 		<mssql-jdbc.version>6.4.0.jre8</mssql-jdbc.version>