Enable ruff FURB161 rule (#164654)

This PR enables FURB161 in ruff.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/164654
Approved by: https://github.com/Skylion007

pyproject.toml

@@ -187,7 +187,6 @@ ignore = [
     # TODO: Remove Python-3.10 specific suppressions
     "B905",
     "UP035",
-    "FURB161",
 ]
 select = [
     "B",

test/torch_np/numpy_tests/core/test_scalar_methods.py

@@ -235,7 +235,7 @@ class TestBitCount(TestCase):
     def test_small(self, itype):
         for a in range(max(np.iinfo(itype).min, 0), 128):
             msg = f"Smoke test for {itype}({a}).bit_count()"
-            assert itype(a).bit_count() == bin(a).count("1"), msg
+            assert itype(a).bit_count() == a.bit_count(), msg
 
     def test_bit_count(self):
         for exp in [10, 17, 63]: