refactor: use max-safe-nth-factorial package in math/base/special/falling-factorial

[gunjjoshi]

Description

What is the purpose of this pull request?

This pull request:

• replaces the hardcoded constant value of maximum possible nth factorial by the constants/float64/max-safe-nth-factorial package, in math/base/special/falling-factorial.

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• Read, understood, and followed the contributing guidelines.

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[kgryte]

LGTM. Thanks, @gunjjoshi!