[BUG] Solve the unpickling error in weight Loading

[phoeenniixx]

There is an Unpickling Error in weight loading of pytorch-forecasting-v1 because the weights are not loaded correctly.
The issue seems to be something related to torch which is leading to fail in CI/CD pipeline.

The issue surfaced after the latest lightning update where they exposed the weights_only param and let torch handle it itself.

Fixes #1998

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[fkiraly]

hm, not yet, right?

[phoeenniixx]

Yes, this PR is incomplete until we find a way to pass weights_only to tuner.

[fkiraly]

would overriding tuner work? Feels dangerous, but if we are forced to?