fix: update tests_square_root.f90 to fix the CI

The literal had too many digits to fit into `REAL(4)`.
Also the test was moved to the `tests`.

Author: vil02

modules/maths/tests_square_root.f90 tests/maths/tests_square_root.f90modules/maths/tests_square_root.f90 renamed to tests/maths/tests_square_root.f90

@@ -47,7 +47,7 @@ end subroutine test_sqrt_perfect_square
 
     ! Test case 4: Square root of a non-perfect square (e.g., 2)
     subroutine test_sqrt_non_perfect_square()
-        expected = 1.41421356
+        expected = 1.4142136
         result = calculate_sqrt(2.0)
         call assert_test(result, expected, "Test 4: Square root of 2", tolerance)
     end subroutine test_sqrt_non_perfect_square