Fix Frontend Failing Test: paddle - mathematical_functions.jax.numpy.sinc

[ZJay07]

PR Description

bfloat16 not supported on paddle.sinc

Related Issue

Close #28674

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• Did you add a function?
• Did you add the tests?
• Did you run your tests and are your tests passing?
• Did pre-commit not fail on any check?
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[Ishticode]

That is correct. Thank you very much for the fix @ZJay07