docs: update utils TypeScript declarations

[stdlib-bot]

This PR updates TypeScript declarations for the @stdlib/utils namespace.

Reviewer Checklist

• Check the scope of the changes (following Conventional Commits):
  • Are these new APIs? Then this is a feat.
  • Are these changes to existing APIs that could break compatibility? Then this is a feat! (i.e., a breaking change).
  • Are these only documentation changes to existing APIs? Then this is docs.
• Update the PR title to align with the change type (feat, feat!, or docs).
• Approve the PR once you are confident about the classification and changes made.

[stdlib-bot]

Coverage Report

Package	Statements	Branches	Functions	Lines
utils	$\color{red}45458/61698$ $\color{green}+73.68%$	$\color{red}759/803$ $\color{green}+94.52%$	$\color{red}23/509$ $\color{green}+4.52%$	$\color{red}45458/61698$ $\color{green}+73.68%$

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

[kgryte]

I'll go ahead and merge, as the lint failures are due to TS bugs in dependent packages.