fix formatting issue

Author: nbayati

tests/test_external_account_authorized_user.py

@@ -32,10 +32,8 @@
 QUOTA_PROJECT_ID = "654321"
 POOL_ID = "POOL_ID"
 PROVIDER_ID = "PROVIDER_ID"
-AUDIENCE = (
-    "//iam.googleapis.com/locations/global/workforcePools/{}/providers/{}".format(
-        POOL_ID, PROVIDER_ID
-    )
+AUDIENCE = "//iam.googleapis.com/locations/global/workforcePools/{}/providers/{}".format(
+    POOL_ID, PROVIDER_ID
 )
 REFRESH_TOKEN = "REFRESH_TOKEN"
 NEW_REFRESH_TOKEN = "NEW_REFRESH_TOKEN"