test: update 404 sanity test

Hitting the real world in tests can stop working when the real world changes.
Hit httpbin.org instead.
Can adjust if httpbin.org turns out to be not reliable.

Author: lread

test/clj_http/lite/client_sanity_test.clj

@@ -26,7 +26,7 @@
                                     :throw-exceptions false})))))
 
 (deftest exception-test
-  (try (client/get "https://site.com/broken")
+  (try (client/get "https://httpbin.org/status/404")
        (is false "should not reach here")
        (catch Exception e
          (is (:headers (ex-data e))))))