input: Write a python function to categorize numbers as "Low" or "High" based on a given threshold.
  assert categorize_numbers([1, 2, 3, 4, 5, 6, 7, 8, 9, 10], 4) == ['Low', 'Low', 'Low', 'High', 'High', 'High', 'High', 'High', 'High', 'High']
  assert categorize_numbers([1, 3, 5, 7, 9], 6) == ['Low', 'Low', 'High', 'High', 'High']
  assert categorize_numbers([2, 4, 6, 8], 5) == ['Low', 'Low', 'High', 'High']
output: def categorize_numbers(numbers, threshold):
      return ['Low' if number <= threshold else 'High' for number in numbers]