Update Pascal VOC export API usage in Grounding DINO notebook

[rkrisa]

Summary

• Replaces the removed sv.detections_to_voc_xml(...) call with the current Pascal VOC export API.
• Passes image_shape=image.shape, matching the current detections_to_pascal_voc signature.
• Cleans up the now-unused depth variable in the export cell.

Validation

• Parsed
  otebooks/automated-dataset-annotation-and-evaluation-with-grounding-dino.ipynb as JSON.
• Installed supervision==0.29.0.post0 into a temporary target directory and confirmed sv.detections_to_voc_xml is no longer available.
• Verified sv.dataset.formats.pascal_voc.detections_to_pascal_voc(...) exists with the expected image_shape parameter.
• Ran a small local export smoke test that generated Pascal VOC XML from a synthetic sv.Detections object.

Fixes #236.

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