message: Python: fix variable name in stubs
diff: @@ -165,7 +165,7 @@ class DuckDBPyResult:
  def fetch_arrow_reader(self, approx_batch_size: int) -> pyarrow.lib.RecordBatchReader: ...
  def fetch_arrow_table(self, chunk_size: int = ...) -> pyarrow.lib.Table: ...
  def fetch_df(self) -> pandas.DataFrame: ...
  - def fetch_df_chunk(self, arg0: int) -> pandas.DataFrame: ...
  + def fetch_df_chunk(self, num_of_vectors: int = ...) -> pandas.DataFrame: ...
  def fetchall(self) -> list: ...
  def fetchdf(self) -> pandas.DataFrame: ...
  def fetchnumpy(self) -> dict: ...
  