fix(deps): update netlify build packages (major)

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@netlify/build	^17.11.0 -> ^18.0.2
@netlify/config	^14.4.3 -> ^15.0.1

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Release Notes

netlify/build

v18.0.2

v18.0.1

v18.0.0

⚠ BREAKING CHANGES

• add netlifyConfig.headers (#​3407)

Features

• add netlifyConfig.headers (#​3407) (14888c7)

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---

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[github-actions]

📊 Benchmark results

Comparing with 8ef7a33

Package size: 331 MB

⬆️ 0.02% increase vs. 8ef7a33

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• T (current commit): 331 MB