fix auth oidc

Author: blink1073

.evergreen/scripts/setup-tests.py

@@ -191,7 +191,7 @@ def handle_test_env() -> None:
         elif test_name == "auth_oidc":
             DB_USER = os.environ["OIDC_ADMIN_USER"]
             DB_PASSWORD = os.environ["OIDC_ADMIN_PWD"]
-            write_env("DB_IP", config["MONGODB_URI"])
+            write_env("DB_IP", os.environ["MONGODB_URI"])
         elif test_name == "index_management":
             config = read_env(f"{DRIVERS_TOOLS}/.evergreen/atlas/secrets-export.sh")
             DB_USER = config["DRIVERS_ATLAS_LAMBDA_USER"]