Fixed compiler error C2061 in VS2022 syntax error: identifier 'T'"

Author: viable-alternative

include/ankerl/unordered_dense.h

@@ -559,7 +559,7 @@ class segmented_vector {
 
     public:
         using difference_type = segmented_vector::difference_type;
-        using value_type = T;
+        using value_type = segmented_vector::value_type;
         using reference = typename std::conditional_t<IsConst, value_type const&, value_type&>;
         using pointer = typename std::conditional_t<IsConst, segmented_vector::const_pointer, segmented_vector::pointer>;
         using iterator_category = std::forward_iterator_tag;