Remove unused import

src/core_codemods/numpy_nan_equality.py

@@ -1,7 +1,7 @@
 from collections import namedtuple
 from typing import Optional
 import libcst as cst
-from libcst import Equal, UnaryOperation, matchers
+from libcst import UnaryOperation, matchers
 from codemodder.codemods.api import BaseCodemod
 from codemodder.codemods.base_codemod import ReviewGuidance