[Java] Upgrade to JUnit 5.8.0.

Author: vyazelenko

build.gradle

@@ -45,7 +45,7 @@ def toolchainLauncher = javaToolchains.launcherFor {
 def checkstyleVersion = '8.45.1'
 def hamcrestVersion = '2.2'
 def mockitoVersion = '3.12.4'
-def junitVersion = '5.7.2'
+def junitVersion = '5.8.0'
 def jmhVersion = '1.33'
 def agronaVersion = '1.12.0'
 def agronaVersionRange = '[1.12,1.13[' // allow any patch release of 1.12.x