Remove pinning of pytest version

[NicolasHug]

Not sure it's fixed yet but let's see
Closes #8238

[pytorch-bot]

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❌ 16 New Failures

As of commit 241211d with merge base f1bcbd3 ():

NEW FAILURES - The following jobs have failed:

• Tests / unittests-extended / linux-job (gh)
  test/test_extended_models.py::TestHandleLegacyInterface::test_pretrained_deprecation[inception_v3_1]
• Tests / unittests-linux (3.10, linux.12xlarge, cpu) / linux-job (gh)
  test/test_extended_models.py::TestHandleLegacyInterface::test_equivalent_behavior_weights[False-False]
• Tests / unittests-linux (3.11, linux.12xlarge, cpu) / linux-job (gh)
  test/test_ops.py::TestRoIAlign::test_autocast_cpu[rois_dtype1-x_dtype1-False-True]
• Tests / unittests-linux (3.12, linux.12xlarge, cpu) / linux-job (gh)
  test/test_extended_models.py::TestHandleLegacyInterface::test_equivalent_behavior_weights[False-False]
• Tests / unittests-linux (3.8, linux.12xlarge, cpu) / linux-job (gh)
  test/test_extended_models.py::TestHandleLegacyInterface::test_equivalent_behavior_weights[False-False]
• Tests / unittests-linux (3.9, linux.12xlarge, cpu) / linux-job (gh)
  test/test_extended_models.py::TestHandleLegacyInterface::test_equivalent_behavior_weights[False-False]
• Tests / unittests-macos (3.10, macos-m1-stable) / macos-job (gh)
  test/test_extended_models.py::TestHandleLegacyInterface::test_equivalent_behavior_weights[False-False]
• Tests / unittests-macos (3.11, macos-m1-stable) / macos-job (gh)
  test/test_extended_models.py::TestHandleLegacyInterface::test_equivalent_behavior_weights[False-False]
• Tests / unittests-macos (3.12, macos-m1-stable) / macos-job (gh)
  test/test_extended_models.py::TestHandleLegacyInterface::test_equivalent_behavior_weights[False-False]
• Tests / unittests-macos (3.8, macos-m1-stable) / macos-job (gh)
  test/test_extended_models.py::TestHandleLegacyInterface::test_equivalent_behavior_weights[False-False]
• Tests / unittests-macos (3.9, macos-m1-stable) / macos-job (gh)
  test/test_extended_models.py::TestHandleLegacyInterface::test_equivalent_behavior_weights[False-False]
• Tests / unittests-windows (3.10, windows.4xlarge, cpu) / windows-job (gh)
  test/test_extended_models.py::TestHandleLegacyInterface::test_equivalent_behavior_weights[False-False]
• Tests / unittests-windows (3.11, windows.4xlarge, cpu) / windows-job (gh)
  test/test_extended_models.py::TestHandleLegacyInterface::test_equivalent_behavior_weights[False-False]
• Tests / unittests-windows (3.12, windows.4xlarge, cpu) / windows-job (gh)
  test/test_extended_models.py::TestHandleLegacyInterface::test_equivalent_behavior_weights[False-False]
• Tests / unittests-windows (3.8, windows.4xlarge, cpu) / windows-job (gh)
  test/test_extended_models.py::TestHandleLegacyInterface::test_equivalent_behavior_weights[False-False]
• Tests / unittests-windows (3.9, windows.4xlarge, cpu) / windows-job (gh)
  test/test_extended_models.py::TestHandleLegacyInterface::test_equivalent_behavior_weights[False-False]

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