Fixed test for test_paddle_softplus

[ZJay07]

PR Description

Added atol and rtol to accommodate small differences in floating-point arithmetic

Related Issue

Closes ##28475

Checklist

• 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?
• Did you follow the steps we provided?

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[Ishticode]

Thank you very much @ZJay07