test: Ignore FutureWarning in test_lightning_integration

[ValerianRey]

Something has changed either in torch or in lightning, but now a new warning can be raised by our lightning integration example, because they use a deprecated function. CI failed because of this: https://github.com/TorchJD/torchjd/actions/runs/21219633107/job/61050582119

[claude]

Code review

No issues found. Checked for bugs and CLAUDE.md compliance.

[ValerianRey]

@claude please merge this whenever checks are completed successfully.

[claude]

Claude finished @ValerianRey's task in 23s —— View job

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