fix(deps): update dependency @netlify/build to ^26.3.9

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@netlify/build	^26.3.8 -> ^26.3.9

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Release Notes

netlify/build

v26.3.9

Compare Source

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[github-actions]

📊 Benchmark results

Comparing with cd3787c

Package size: 443 MB

(no change)

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