fix: use STDLIB_CONSTANT_FLOAT64_SQRT_TWO instead of recomputing sqrt(2)

[ChaitraTM]

Resolves #5712.

Description

What is the purpose of this pull request?

This pull request:

• updates the normal quantile implementation to use STDLIB_CONSTANT_FLOAT64_SQRT_TWO instead of recalculating sqrt(2) each time. This improves efficiency and maintains consistency with similar implementations.

Related Issues

• {{TODO: add description describing what this pull request does}}

Related Issues

Does this pull request have any related issues?

This pull request:

• Resolves Address commit comments (commit 1f5d85a) #5712

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No.

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• Read, understood, and followed the contributing guidelines.

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@stdlib-js/reviewers

[Planeshifter]

Going to merge #5763 instead. Please take a look for the changes that were expected.