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

for more information, see https://pre-commit.ci

Author: pre-commit-ci[bot]

sklearn_extra/robust/_robust_weighted_estimator_helper.pyx

@@ -180,4 +180,4 @@ cdef class Huber(Regression):
             return -self.c
 
     def __reduce__(self):
-        return Huber, (self.c,)
+        return Huber, (self.c,)