Systematically change `_` to `const_name` in pybind11_abseil, pybind11_protobuf.

This is a functional no-op.

Note that `_` was deprecated already in Dec 2021 (https://github.com/pybind/pybind11/pull/3423).

PiperOrigin-RevId: 575085924

pybind11_abseil/absl_casters.h

@@ -459,7 +459,8 @@ struct type_caster<absl::Span<T>> {
     return *this;
   }
 
-  static constexpr auto name = _("Span[") + make_caster<T>::name + _("]");
+  static constexpr auto name =
+      const_name("Span[") + make_caster<T>::name + const_name("]");
 
   // We do not allow moving because 1) spans are super lightweight, so there's
   // no advantage to moving and 2) the span cannot exist without the caster,

pybind11_abseil/status_caster.h

@@ -52,7 +52,7 @@ struct type_caster<google::NoThrowStatus<StatusType>> {
 template <>
 struct type_caster<absl::Status> : public type_caster_base<absl::Status> {
  public:
-  static constexpr auto name = _("None");
+  static constexpr auto name = const_name("None");
   //  Convert C++ -> Python.
   static handle cast(const absl::Status* src, return_value_policy policy,
                      handle parent, bool throw_exception = true) {

pybind11_abseil/statusor_caster.h

@@ -20,8 +20,9 @@ namespace detail {
 template <typename PayloadType>
 struct NoThrowStatusType<absl::StatusOr<PayloadType>> {
   using NoThrowAbslStatus = type_caster_base<absl::Status>;
-  static constexpr auto name = _("Union[") + NoThrowAbslStatus::name + _(", ") +
-                               make_caster<PayloadType>::name + _("]");
+  static constexpr auto name = const_name("Union[") + NoThrowAbslStatus::name +
+                               const_name(", ") +
+                               make_caster<PayloadType>::name + const_name("]");
 };
 
 // Convert absl::StatusOr<T>.