refactor: use external constant in math/base/special/tribonacci

[gunjjoshi]

Description

What is the purpose of this pull request?

This pull request:

• completes the TODO to use the external constant constants/float64/max-safe-nth-tribonacci in math/base/special/tribonacci

Related Issues

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None.

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Other

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• Read, understood, and followed the contributing guidelines.

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[stdlib-bot]

Coverage Report

Package	Statements	Branches	Functions	Lines
math/base/special/tribonacci	$\color{green}150/150$ $\color{green}+100.00\%$	$\color{green}8/8$ $\color{green}+100.00\%$	$\color{green}1/1$ $\color{green}+100.00\%$	$\color{green}150/150$ $\color{green}+100.00\%$

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

[kgryte]

LGTM. Thanks, @gunjjoshi!