fix(_dtypes): non pandas boolean numpy type was deprecated

when decoding nullable boolean from parquet files created without pandas
we were facing an AttributeError on np.float_ that was deprecated and replaced by np.float64_

fastparquet/api.py

@@ -993,7 +993,7 @@ def _dtypes(self, categories=None):
                         if self.pandas_nulls:
                             dtype[col] = converted_types.nullable[dt]
                         else:
-                            dtype[col] = np.float_()
+                            dtype[col] = np.float64_()
                 elif dt == 'S12':
                     dtype[col] = 'M8[ns]'
             self._base_dtype = dtype