Fix flaky test due to upgrade of dependent libs on Apple M processor

[lintool]

Minor tweak to fix this issue:

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FAIL: test_msmarco_passage_tct_colbert_bf_d2q_hybrid_otf (test_tct_colbert.TestTctColBert)
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Traceback (most recent call last):
  File "/Users/jimmylin/workspace/pyserini/integrations/dense/test_tct_colbert.py", line 108, in test_msmarco_passage_tct_colbert_bf_d2q_hybrid_otf
    self.assertAlmostEqual(score, 0.3647, places=4)
AssertionError: 0.3646 != 0.3647 within 4 places (0.0001000000000000445 difference)

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Ran 33 tests in 31708.497s

[ronakice]

LG!