Use std::ranges::subrange instead of boost::iterator_range

include/util/packed_vector.hpp

@@ -340,6 +340,8 @@ template <typename T, std::size_t Bits, storage::Ownership Ownership> class Pack
         {
         }
 
+        ReferenceT operator[](difference_type n) const { return container->operator[](index + n); }
+
       private:
         void increment() { ++index; }
         void decrement() { --index; }

include/util/vector_view.hpp

@@ -42,6 +42,8 @@ class VectorViewIterator : public boost::iterator_facade<VectorViewIterator<Data
     explicit VectorViewIterator() : m_value(nullptr) {}
     explicit VectorViewIterator(DataT *x) : m_value(x) {}
 
+    reference operator[](difference_type n) const { return m_value[n]; }
+
   private:
     void increment() { ++m_value; }
     void decrement() { --m_value; }