specify `eslint-plugin-n@^16.0.0` as valid peer dependency

[AprilSylph]

Renovate cannot update eslint-plugin-n in my NPM projects to v16 because eslint-config-semistandard does not see it as a valid peer dependency:

• https://github.com/AprilSylph/XKit-Rewritten/pull/1298#issuecomment-1741941410
• https://github.com/AprilSylph/Palettes-for-Tumblr/pull/157#issuecomment-1571155121
• https://github.com/AprilSylph/Outbox-for-Tumblr/pull/70#issuecomment-1571188535

Since eslint-config-semistandard does not directly make use of eslint-plugin-n, but rather inherits the usage from eslint-plugin-standard, this PR proposes to bump the peer dependency version range for eslint-plugin-n to match that of eslint-plugin-standard@17.1.0.

(Interesting that dependabot isn't trying to perform this major upgrade...)

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Packages	Version	New capabilities	Transitives	Size	Publisher
eslint-plugin-n	15.7.0...16.6.1	None	+6/-6	860 kB	weiran.zsd