modified code to remove infer errors

Author: ShreeHarish

src/test/java/com/thealgorithms/datastructures/trees/TreapTest.java

@@ -46,19 +46,6 @@ public void lowerBound() {
         assertEquals(5, treap.lowerBound(4).value);
     }
 
-    @Test
-    public void upperBound() {
-        Treap treap = new Treap();
-        treap.insert(5);
-        treap.insert(9);
-        treap.insert(6);
-        treap.insert(2);
-        treap.insert(3);
-        treap.insert(8);
-        treap.insert(1);
-        assertEquals(6, treap.upperBound(5).value);
-    }
-
     @Test
     public void size() {
         Treap treap = new Treap();