Fix muxing integration tests (#1189)

There seemed to be a race condition between two different commits on the
same day, one of which renamed a method and the failure to call the
method was shadowed by a try-except. The result was that we couldn't run
the muxing integration tests.

Author: jhrozek

tests/integration/integration_tests.py

@@ -231,7 +231,7 @@ async def _setup_muxing(
         provider_endpoint = muxing_config.get("provider_endpoint")
         try:
             data_with_api_keys = self.replace_env_variables(provider_endpoint["data"], os.environ)
-            response_create_provider = self.call_codegate(
+            response_create_provider = self.call_provider(
                 provider=provider,
                 url=provider_endpoint["url"],
                 headers=provider_endpoint["headers"],
@@ -250,7 +250,7 @@ async def _setup_muxing(
                 mux["provider_id"] = created_provider_endpoint["id"]
 
             # The endpoint actually takes a list
-            self.call_codegate(
+            self.call_provider(
                 provider=provider,
                 url=muxes_rules["url"],
                 headers=muxes_rules["headers"],