fix(deps): update dependency @netlify/build to ^27.15.6

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@netlify/build	^27.15.5 -> ^27.15.6

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Release Notes

netlify/build

v27.15.6

Compare Source

Bug Fixes

• update semver logic (#​4459) (3b191c8)

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[github-actions]

📊 Benchmark results

Comparing with 54b12c8

Package size: 222 MB

(no change)

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• T (current commit): 222 MB