[fix][build] Upgrade kerby to 2.1.0

Signed-off-by: Zixuan Liu <nodeces@gmail.com>

pom.xml

@@ -275,7 +275,7 @@ flexible messaging model and an intuitive client API.</description>
 
     <!-- Set docker-java.version to the version of docker-java used in Testcontainers -->
     <docker-java.version>3.3.0</docker-java.version>
-    <kerby.version>1.1.1</kerby.version>
+    <kerby.version>2.1.0</kerby.version>
     <testng.version>7.7.1</testng.version>
     <mockito.version>5.6.0</mockito.version>
     <javassist.version>3.25.0-GA</javassist.version>