Remove pinning of pytest version

[NicolasHug]

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

[pytorch-bot]

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• Upgrade MacOS runner to 14

❌ 19 New Failures

As of commit aea8841 with merge base f0c94cd ():

NEW FAILURES - The following jobs have failed:

• Build Linux Conda / pytorch/vision / upload / conda-py3_8-cuda11_8 (gh)
  Unable to find an artifact with the name: pytorch_vision__3.8_cu118_
• Build Linux Conda / pytorch/vision / upload / conda-py3_8-cuda12_1 (gh)
  Unable to find an artifact with the name: pytorch_vision__3.8_cu121_
• Build Linux Conda / pytorch/vision / upload / conda-py3_8-cuda12_4 (gh)
  Unable to find an artifact with the name: pytorch_vision__3.8_cu124_
• 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_extended_models.py::TestHandleLegacyInterface::test_equivalent_behavior_weights[False-False]
• 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_transforms_v2.py::TestLinearTransform::test_transform[cpu-dtype1-make_image_tensor]
• 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_transforms_v2.py::TestLinearTransform::test_transform[cpu-dtype1-make_image_tensor]
• 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_transforms_v2.py::TestScaleJitter::test_transform[cpu-make_video]
• Tests / unittests-windows (3.8, windows.4xlarge, cpu) / windows-job (gh)
  test/test_transforms_v2.py::TestScaleJitter::test_transform[cpu-make_video]
• Tests / unittests-windows (3.9, windows.4xlarge, cpu) / windows-job (gh)
  test/test_transforms_v2.py::TestScaleJitter::test_transform[cpu-make_video]

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