feat: deduce noexcept signature from ptdm (#15)

Address [LWG 4425](https://cplusplus.github.io/LWG/issue4425)

Author: zhihaoy

include/std23/__functional_base.h

@@ -212,7 +212,7 @@ struct _drop_first_arg_to_invoke<R (*)(G, Args...) noexcept, T>
 template<class T, class M, class G> requires std::is_object_v<M>
 struct _drop_first_arg_to_invoke<M G::*, T>
 {
-    using type = std::invoke_result_t<M G::*, T>();
+    using type = std::invoke_result_t<M G::*, T>() noexcept;
 };
 
 template<class T, class M, class G> requires std::is_function_v<M>

tests/function_ref/test_ctad.cpp

@@ -65,11 +65,13 @@ void test_ctad()
     {
         A a;
         auto fr = function_ref(nontype<&A::data>, &a);
-        static_assert(std::is_same_v<decltype(fr), function_ref<int &()>>);
+        static_assert(
+            std::is_same_v<decltype(fr), function_ref<int &() noexcept>>);
 
         auto fc = function_ref(nontype<&A::data>, std::as_const(a));
-        static_assert(std::is_same_v<decltype(fc), function_ref<int const &()>>,
-                      "type to retrieve data member depends on object");
+        static_assert(
+            std::is_same_v<decltype(fc), function_ref<int const &() noexcept>>,
+            "type to retrieve data member depends on object");
     }
 
     {