fix paddle problem with zipping iterables of tensors

[Sam-Armstrong]

Fixes some failing checks on the tracer repo caused by changes in paddle 2.6.0. I've raised an issue on the paddle repo, but this should serve as a temporary solution.

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[vedpatwardhan]

The tests for gather_nd seem to be failing due to an unsupported dtype issue, could you please add bfloat16 and float16 as the unsupported dtypes for this backend implementation to see if the test passes? Rest of the changes seem good, thanks @Sam-Armstrong 😄

[Sam-Armstrong]

Thanks @vedpatwardhan, looks like the test is passing now 😁 I'll go ahead and merge