chore(deps): update dependency linkinator to v6

[renovate-bot]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
linkinator	^5.0.0 -> ^6.0.0

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Release Notes

JustinBeckwith/linkinator (linkinator)

v6.0.0

Compare Source

• build!: drop support for node 16 (#​575) (351a7c9), closes #​575

BREAKING CHANGES

• This module now requires node.js 18 and up. It includes a variety of related changes:

• Migrate from gts to xo for linting and code formatting
• Upgrade multiple deps to the latest version that were blocked on node 16
• Drop the codecov dependency and move to the github action
• Update the tsconfig to target Node16 for the module strategy

It's entirely possible this change didn't break anything for most users, but it's also possible it did.

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