[Java] Upgrade to Mockito 3.12.4.

Author: mjpt777

build.gradle

@@ -44,7 +44,7 @@ def toolchainLauncher = javaToolchains.launcherFor {
 
 def checkstyleVersion = '8.45.1'
 def hamcrestVersion = '2.2'
-def mockitoVersion = '3.12.3'
+def mockitoVersion = '3.12.4'
 def junitVersion = '5.7.2'
 def jmhVersion = '1.33'
 def agronaVersion = '1.12.0'