[CI] Reduce Flakiness For test_spec_decode.py::test_suffix_decoding_acceptance (#30367)

Signed-off-by: Micah Williamson <micah.williamson@amd.com>

Author: micah-wil

tests/v1/e2e/test_spec_decode.py

@@ -191,8 +191,8 @@ def test_suffix_decoding_acceptance(
  # Expect the acceptance rate to improve.
  assert first_accept_rate < last_accept_rate
 
- # Heuristic: expect at least 82.5% acceptance rate at the end.
- assert last_accept_rate > 0.825
+ # Heuristic: expect at least 80.0% acceptance rate at the end.
+ assert last_accept_rate > 0.80
 
  del spec_llm
  torch.cuda.empty_cache()