input: Write a python function to return the squares of even numbers from a given list of numbers.
  assert lambda_handler({'numbers': [1, 2, 3, 4, 5]}, {})['result'] == [4, 16]
  assert lambda_handler({'numbers': [10, 15, 20, 25]}, {})['result'] == [100, 400]
  assert lambda_handler({'numbers': [3, 6, 9, 12]}, {})['result'] == [36, 144]
output: def lambda_handler(event, context):
      numbers = event['numbers']
      result = [n**2 for n in numbers if n % 2 == 0]
      return {'result': result}