input: Write a python function to convert all strings in a list to uppercase.
  assert convert_to_uppercase(["Hello", "world", "how", "are", "you"]) == ["HELLO", "WORLD", "HOW", "ARE", "YOU"]
  assert convert_to_uppercase(["python", "code"]) == ["PYTHON", "CODE"]
  assert convert_to_uppercase(["test", "Function"]) == ["TEST", "FUNCTION"]
output: def convert_to_uppercase(lst):
      return [s.upper() for s in lst]