fix(deps): update dependency @netlify/config to ^15.0.2

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@netlify/config	^15.0.1 -> ^15.0.2

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Release Notes

netlify/build

v15.0.2

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[github-actions]

📊 Benchmark results

Comparing with 0d491b6

Package size: 331 MB

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