Remove parser dependency from ruff-python-ast (#6096)

crates/ruff_python_formatter/src/statement/stmt_expr.rs

@@ -1,5 +1,5 @@
+use rustpython_ast::{Expr, Operator, StmtExpr};
 use rustpython_parser::ast;
-use rustpython_parser::ast::{Expr, Operator, StmtExpr};
 
 use crate::expression::maybe_parenthesize_expression;
 use crate::expression::parentheses::Parenthesize;