Fix: removes scope to avoid unnecessary duplication (#1503)

* Fix: removes scope to avoid unnecessary duplication

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---------

Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>

Author: chalmerlowe

google/cloud/bigquery/client.py

@@ -225,10 +225,7 @@ class Client(ClientWithProject):
             to acquire default credentials.
     """
 
-    SCOPE = (  # type: ignore
-        "https://www.googleapis.com/auth/bigquery",
-        "https://www.googleapis.com/auth/cloud-platform",
-    )
+    SCOPE = ("https://www.googleapis.com/auth/cloud-platform",)  # type: ignore
     """The scopes required for authenticating as a BigQuery consumer."""
 
     def __init__(