fix: correct boundary check for Fibonacci function (issue #7240)

[vidishadeswal]

Resolves #7240 .

Description

What is the purpose of this pull request?

This pull request:

-fixes the boundary check in the Fibonacci function to properly handle invalid input values and prevent undefined behavior when n is outside the valid range.

Related Issues

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This pull request:

• resolves Fix JavaScript lint errors #7240

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Coverage Report

Package	Statements	Branches	Functions	Lines
math/base/special/fibonacci	$\color{red}71/74$ $\color{green}+95.95\%$	$\color{green}1/1$ $\color{green}+100.00\%$	$\color{red}0/1$ $\color{green}+0.00\%$	$\color{red}71/74$ $\color{green}+95.95\%$

The above coverage report was generated for the changes in this PR.

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