fix: C++20 in Windows

Signed-off-by: Henry Schreiner <henryschreineriii@gmail.com>

Author: henryiii

tests/test_pytypes.cpp

@@ -1010,7 +1010,7 @@ TEST_SUBMODULE(pytypes, m) {
 
     m.def("transform_tuple_plus_one", [](py::tuple &tpl) {
         py::list ret{};
-        for (auto it : tpl | std::views::transform([](auto &o) { return py::cast<int>(o) + 1; })) {
+        for (auto&& it : tpl | std::views::transform([](const auto &o) { return py::cast<int>(o) + 1; })) {
             ret.append(py::int_(it));
         }
         return ret;
@@ -1025,7 +1025,7 @@ TEST_SUBMODULE(pytypes, m) {
 
     m.def("transform_list_plus_one", [](py::list &lst) {
         py::list ret{};
-        for (auto it : lst | std::views::transform([](auto &o) { return py::cast<int>(o) + 1; })) {
+        for (auto&& it : lst | std::views::transform([](const auto &o) { return py::cast<int>(o) + 1; })) {
             ret.append(py::int_(it));
         }
         return ret;