Fix NestedTensor deprecation warning in SDPA tutorial

[dorbittonn]

Add layout=torch.jagged parameter to nested_tensor call to suppress the prototype API warning and use the recommended jagged layout.

Checklist

• Only one issue is addressed in this pull request
• Labels from the issue that this PR is fixing are added to this pull request
• No unnecessary issues are included into this pull request.

[pytorch-bot]

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