PERF: Fix ASV CSV benchmarks (#60689)

Author: rhshadrach

asv_bench/benchmarks/io/csv.py

@@ -594,7 +594,7 @@ def setup(self):
         self.StringIO_input = StringIO(data)
 
     def time_read_csv_index_col(self):
-        read_csv(self.StringIO_input, index_col="a")
+        read_csv(self.data(self.StringIO_input), index_col="a")
 
 
 class ReadCSVDatePyarrowEngine(StringIORewind):
@@ -605,7 +605,7 @@ def setup(self):
 
     def time_read_csv_index_col(self):
         read_csv(
-            self.StringIO_input,
+            self.data(self.StringIO_input),
             parse_dates=["a"],
             engine="pyarrow",
             dtype_backend="pyarrow",