[Cherry pick] rename BoundingBoxes module to match class name (#7910)

[NicolasHug]

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[pytorch-bot]

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❌ 4 New Failures, 5 Unrelated Failures

As of commit dcf0378 with merge base f1b4c7a ():

NEW FAILURES - The following jobs have failed:

• linux (linux.g5.4xlarge.nvidia.gpu, cuda, 11.8) / linux-job (gh)
• pytorch/vision / manywheel-py3_8-rocm5_5 (gh)
• pytorch/vision / manywheel-py3_8-rocm5_6 (gh)
• unittests-windows (3.11, windows.4xlarge, cpu) / windows-job (gh)

FLAKY - The following jobs failed but were likely due to flakiness present on trunk:

• unittests-linux (3.8, linux.g5.4xlarge.nvidia.gpu, cuda, 11.8) / linux-job (gh)
• unittests-windows (3.10, windows.4xlarge, cpu) / windows-job (gh)
• unittests-windows (3.8, windows.4xlarge, cpu) / windows-job (gh)
• unittests-windows (3.9, windows.4xlarge, cpu) / windows-job (gh)
• windows (windows.4xlarge, cpu) / windows-job (gh)

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