input: Write a function named `generate_random_3x3_array` to generate a 3x3 array of random integers ranging from 1 to 5 using the NumPy library. The function should return the generated array. If the NumPy library is not available, return None.
  assert np.array_equal(generate_random_3x3_array().shape, (3, 3))==True
  assert np.all(generate_random_3x3_array() >= 1) == True
  assert np.all(generate_random_3x3_array() <= 5) == True
  assert np.array_equal(generate_random_3x3_array().dtype, np.int64) == True
  from unittest.mock import patch
  with patch.dict('sys.modules', {'numpy': None}):
      assert generate_random_3x3_array() == None
output: try:
      import numpy as np
      return np.random.randint(1, 6, (3, 3))
  except ImportError:
      return None