Update util.py

Author: BobTheBuidler

mypyc/irbuild/util.py

@@ -149,7 +149,6 @@ def set_mypyc_attr(key: MypycAttr, value: Any, line: int) -> None:
         if d := get_mypyc_attr_call(dec):
             line = d.line
 
-            key: MypycAttr
             for name, arg in zip(d.arg_names, d.args):
                 if name is None:
                     if isinstance(arg, StrExpr):