fix mypy err

Author: BobTheBuidler

mypyc/transform/redundant_box_elimination.py

@@ -1,5 +1,3 @@
-from typing import Dict
-
 from mypyc.ir.func_ir import FuncIR
 from mypyc.ir.ops import (
     Assign,
@@ -46,7 +44,7 @@ def build_use_map(fn: FuncIR) -> Dict[Value, list[Op]]:
 
 
 class BoxUnboxEliminationTransform(IRTransform):
-    def __init__(self, builder: LowLevelIRBuilder, use_map: Dict[Value, list[Op]]):
+    def __init__(self, builder: LowLevelIRBuilder, use_map: dict[Value, list[Op]]):
         super().__init__(builder)
         self.use_map = use_map