fix: include io.Base in the PathType (#2323)

Author: sycai

google/cloud/bigquery/client.py

@@ -139,7 +139,7 @@
 
 if typing.TYPE_CHECKING:  # pragma: NO COVER
     # os.PathLike is only subscriptable in Python 3.9+, thus shielding with a condition.
-    PathType = Union[str, bytes, os.PathLike[str], os.PathLike[bytes]]
+    PathType = Union[str, bytes, os.PathLike[str], os.PathLike[bytes], io.IOBase]
 _DEFAULT_CHUNKSIZE = 100 * 1024 * 1024  # 100 MB
 _MAX_MULTIPART_SIZE = 5 * 1024 * 1024
 _DEFAULT_NUM_RETRIES = 6