Fix test: correct expected diameter value from 5.0 to 4.0

Author: motalib-code

src/test/java/com/thealgorithms/geometry/RotatingCalipersTest.java

@@ -21,7 +21,7 @@ void testDiameterSimpleTriangle() {
         );
 
         RotatingCalipers.PointPair diameter = RotatingCalipers.diameter(triangle);
-        assertEquals(5.0, diameter.distance, EPSILON);
+        assertEquals(4.0, diameter.distance, EPSILON);
     }
 
     @Test