fix(deps): update dependency @netlify/plugins-list to ^6.15.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@​netlify/plugins-list	^6.14.0 -> ^6.15.0

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[github-actions]

📊 Benchmark results

Comparing with 0d5d78b

Package size: 443 MB

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