Merge pull request #10552 from thalesmg/fix-flaky-banned-test-v50

test(banned): attempt to fix flaky test

apps/emqx/test/emqx_banned_SUITE.erl

@@ -186,7 +186,7 @@ t_session_taken(_) ->
                     false
             end
         end,
-        6000
+        15_000
     ),
     Publish(),