PyCXX: [skip ci] avoid MSVC build failure (still needs a proper fix)

src/CXX/Python3/Objects.hxx

@@ -1298,8 +1298,8 @@ namespace Py
 
         virtual size_type max_size() const
         {
-            //return std::string::npos; // ?
-            return std::numeric_limits<size_type>::max();
+            return std::string::npos; // ?
+            //return std::numeric_limits<size_type>::max();
         }
 
         virtual size_type capacity() const