fix(deps): update dependency load-plugin to v6

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
load-plugin	^5.1.0 -> ^6.0.0

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Release Notes

wooorm/load-plugin (load-plugin)

v6.0.0

Compare Source

• 8e7f3a4 Change to use file URLs, replace cwd with from
  migrate: expect file URIs as output from resolvePlugin;
  also pass file URLs (file://…) in as from, such as with import.meta.url, instead of file paths in cwd
• 9cea089 Change to require Node.js 16
  migrate: update too
• 18e5128 Change to use exports
  migrate: don’t use private APIs

Full Changelog: wooorm/load-plugin@5.1.0...6.0.0

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[JamieSlome]

@coopernetes - do these major changes look breaking to you?