Update statements.py (#2994)

* Update statements.py

* Update statements.py

Author: sobolevn

wemake_python_styleguide/visitors/tokenize/statements.py

@@ -140,7 +140,7 @@ def _annotate_brackets(
         tokens: List[tokenize.TokenInfo],
     ) -> Mapping[int, int]:
         """Annotates each opening bracket with the nested level index."""
-        brackets = {bracket: 0 for bracket in MATCHING}
+        brackets = dict.fromkeys(MATCHING, 0)
         for token in tokens:
             if token.exact_type in MATCHING.keys():
                 brackets[token.exact_type] += 1