removed unused import

Author: 0xalpharush

slither/slithir/operations/new_contract.py

@@ -6,7 +6,6 @@
 from slither.core.solidity_types import UserDefinedType
 from slither.slithir.operations import Call, OperationWithLValue
 from slither.slithir.utils.utils import is_valid_lvalue
-from slither.slithir.variables.constant import Constant
 from slither.slithir.variables.temporary import TemporaryVariable
 from slither.slithir.variables.temporary_ssa import TemporaryVariableSSA