Use hostname instead of hardcoded IPv4 loopback

Author: uglide

tests/test_asyncio/test_cwe_404.py

@@ -208,7 +208,7 @@ def remap(address):
         port = cluster_port + i
         remapped = remap_base + i
         forward_addr = hostname, port
-        proxy = DelayProxy(addr=("127.0.0.1", remapped), redis_addr=forward_addr)
+        proxy = DelayProxy(addr=(hostname, remapped), redis_addr=forward_addr)
         proxies.append(proxy)
 
     def all_clear():
@@ -233,7 +233,7 @@ def set_delay(delay: float):
             await stack.enter_async_context(p)
 
         r = RedisCluster.from_url(
-            f"redis://127.0.0.1:{remap_base}", address_remap=remap
+            f"redis://{hostname}:{remap_base}", address_remap=remap
         )
         try:
             await r.initialize()