Relax the flaky test threshold on RHEL 10.0 x86_64

Author: nobu

test/ruby/test_gc_compact.rb

@@ -324,7 +324,7 @@ def test_moving_arrays_up_heaps
       }.resume
 
       stats = GC.verify_compaction_references(expand_heap: true, toward: :empty)
-      assert_operator(stats.dig(:moved_up, :T_ARRAY) || 0, :>=, ARY_COUNT - 15)
+      assert_operator(stats.dig(:moved_up, :T_ARRAY) || 0, :>=, (0.9995 * ARY_COUNT).to_i)
       refute_empty($arys.keep_if { |o| ObjectSpace.dump(o).include?('"embedded":true') })
     end;
   end