fix(deps): update dependency @netlify/build to ^27.20.3

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@netlify/build	^27.20.1 -> ^27.20.3

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[github-actions]

📊 Benchmark results

Comparing with 75e753a

Package size: 227 MB

⬇️ 0.00% decrease vs. 75e753a

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• T (current commit): 227 MB