fix(deps): update dependency @netlify/config to ^15.7.1

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@netlify/config	^15.7.0 -> ^15.7.1

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Release Notes

netlify/build

v15.7.1

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[github-actions]

📊 Benchmark results

Comparing with 7af5fa0

Package size: 357 MB

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• T (current commit): 357 MB