Update deprecated APIs in introyt1_tutorial

[svekars]

This PR modernizes the Introduction to PyTorch tutorial (introyt1_tutorial.py) by replacing deprecated APIs with their current equivalents.

Deprecated API replacements:

• torch.det() → torch.linalg.det() (deprecated alias since PyTorch 1.9)
• torch.svd() → torch.linalg.svd() (deprecated since PyTorch 1.9, will be removed in a future release)
• transforms.ToTensor() → v2.ToImage() + v2.ToDtype(torch.float32, scale=True) (the entire non-v2 transforms module is unmaintained; ToTensor lives in torchvision.transforms.v2._deprecated)
• import torchvision.transforms as transforms → from torchvision.transforms import v2

Python style modernization:

• super(ClassName, self).init() → super().init() (Python 3 style, PEP 3135)
• '%d' % value string formatting → f-strings

Documentation updates:

• Added .. note:: about the video being recorded with an older PyTorch version
• Added .. note:: about torch.linalg as the recommended linear algebra API
• Updated transforms explanation text to describe v2.ToImage() and v2.ToDtype() instead of ToTensor()
• Updated inline code snippet for calculating dataset mean/std to use v2 transforms
• Added link to torchvision.transforms.v2 docs

cc @albanD @jbschlosser

[pytorch-bot]

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