Pin pytest==8.4.2

[huydhn]

Testing to see if this fixes https://github.com/pytorch/ao/actions/runs/19239143137/job/54997062535 and https://github.com/pytorch/ao/actions/runs/19239143151

cc @jerryzh168

[pytorch-bot]

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⏳ 1 Pending, 4 Unrelated Failures

As of commit a1f090e with merge base e8c4d09 ():

BROKEN TRUNK - The following jobs failed but were present on the merge base:

👉 Rebase onto the `viable/strict` branch to avoid these failures

• Run Regression Tests / test (CPU 2.6, linux.4xlarge, torch==2.6.0 --index-url https://download.pytorch.org/whl/cpu, cpu) / linux-job (gh) (trunk failure)
  test/test_low_bit_optim.py::TestOptim::test_param_groups_optim_name_AdamFp8_device_cpu
• Run Regression Tests / test (CPU 2.7, linux.4xlarge, torch==2.7.0 --index-url https://download.pytorch.org/whl/cpu, cpu) / linux-job (gh) (trunk failure)
  test/test_low_bit_optim.py::TestOptim::test_param_groups_optim_name_AdamFp8_device_cpu
• Run Regression Tests / test (CPU 2.8, linux.4xlarge, torch==2.8.0 --index-url https://download.pytorch.org/whl/cpu, cpu) / linux-job (gh) (trunk failure)
  test/test_low_bit_optim.py::TestOptim::test_param_groups_optim_name_AdamFp8_device_cpu
• Run Regression Tests / test-nightly (CPU Nightly, linux.4xlarge, --pre torch --index-url https://download.pytorch.org/wh... / linux-job (gh) (trunk failure)
  test/test_low_bit_optim.py::TestOptim::test_param_groups_optim_name_AdamFp8_device_cpu

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[jerryzh168]

I think we can land this, seems L4 test error is gone now