Update org.mockito:mockito-core to 5.6.0

Change-Id: Ie31b1db1867079147fce08df05185eb72fffdcc7

WORKSPACE

diff --git a/WORKSPACE b/WORKSPACE
index 017396e..0e0df99 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -231,8 +231,8 @@
 
 maven_jar(
     name = "mockito",
-    artifact = "org.mockito:mockito-core:2.23.0",
-    sha1 = "497ddb32fd5d01f9dbe99a2ec790aeb931dff1b1",
+    artifact = "org.mockito:mockito-core:5.6.0",
+    sha1 = "550b7a0eb22e1d72d33dcc2e5ef6954f73100d76",
 )
 
 BYTE_BUDDY_VERSION = "1.10.7"