[pre-commit.ci] auto fixes from pre-commit.com hooks

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Author: pre-commit-ci[bot]

src/pyFAI/units.py

@@ -44,7 +44,7 @@
 import copy
 import logging
 from collections.abc import Callable
-from math import sin, cos, pi as PI
+from math import pi as PI
 from functools import wraps
 import numpy
 import scipy.constants