remove io since StringIO is already imported

Author: KevsterAmp

pandas/tests/io/test_common.py

@@ -5,7 +5,6 @@
 import codecs
 import errno
 from functools import partial
-import io
 from io import (
     BytesIO,
     StringIO,
@@ -680,6 +679,6 @@ def test_pickle_reader(reader):
 def test_pyarrow_read_csv_datetime_dtype():
     data = "date,id\n20/12/2025,a\n,b\n31/12/2020,c"
     df = pd.read_csv(
-        io.StringIO(data), parse_dates=["date"], dayfirst=True, dtype_backend="pyarrow"
+        StringIO(data), parse_dates=["date"], dayfirst=True, dtype_backend="pyarrow"
     )
     assert (df["date"].dtype) == "datetime64[s]"