Upgrade to Mockito 5.16.0

Closes spring-projectsgh-44618

Author: snicoll

gradle.properties

@@ -16,7 +16,7 @@ javaFormatVersion=0.0.43
 junitJupiterVersion=5.11.4
 kotlinVersion=1.9.25
 mavenVersion=3.9.4
-mockitoVersion=5.15.2
+mockitoVersion=5.16.0
 nativeBuildToolsVersion=0.10.5
 snakeYamlVersion=2.4
 springFrameworkVersion=6.2.4-SNAPSHOT