fix(deps): update dependency @netlify/build to ^27.15.4

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@netlify/build	^27.14.0 -> ^27.15.4

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[github-actions]

📊 Benchmark results

Comparing with a5bfa11

Package size: 222 MB

(no change)

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• T (current commit): 222 MB