Get rid of static_assert with random_access_iterator for CXX20.

Signed-off-by: apradhana <andre.pradhana@gmail.com>

Author: apradhana

openvdb/openvdb/util/PagedArray.h

@@ -635,11 +635,6 @@ class PagedArray<ValueT, Log2PageSize>::ConstIterator
     const PagedArray* mParent;
 };// Public class PagedArray::ConstIterator
 
-#ifdef OPENVDB_HAS_CXX20
-static_assert(std::random_access_iterator<PagedArray<int, 10UL>::ConstIterator>,
-    "ConstIterator must satisfy random_access_iterator concept");
-#endif
-
 
 ////////////////////////////////////////////////////////////////////////////////
 
@@ -696,11 +691,6 @@ class PagedArray<ValueT, Log2PageSize>::Iterator
     PagedArray* mParent;
 };// Public class PagedArray::Iterator
 
-#ifdef OPENVDB_HAS_CXX20
-static_assert(std::random_access_iterator<PagedArray<int, 10UL>::Iterator>,
-    "Iterator must satisfy random_access_iterator concept");
-#endif
-
 ////////////////////////////////////////////////////////////////////////////////
 
 // Private member-class of PagedArray implementing a memory page