fix linting

tests/external/api/test_credentials.py

@@ -3,8 +3,8 @@
     AzureCliCredential,
     DeviceCodeCredential,
 )
-
 from click.exceptions import Exit
+
 from data_safe_haven.directories import config_dir
 from data_safe_haven.external.api.credentials import (
     AzureSdkCredential,
@@ -36,9 +36,7 @@ def test_confirm_credentials_interactive_fail(
     ):
         DeferredCredential.cache_ = set()
         credential = AzureSdkCredential(skip_confirmation=False)
-        with pytest.raises(
-            Exit
-        ):
+        with pytest.raises(Exit):
             credential.get_credential()
 
     def test_confirm_credentials_interactive_cache(
@@ -60,9 +58,7 @@ def test_decode_token_error(
         self, mock_azureclicredential_get_token_invalid  # noqa: ARG002
     ):
         credential = AzureSdkCredential(skip_confirmation=True)
-        with pytest.raises(
-            Exit
-        ):
+        with pytest.raises(Exit):
             credential.decode_token(credential.token)