fix(deps): update dependency @netlify/build to ^29.9.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@netlify/build	^29.8.0 -> ^29.9.0

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Release Notes

netlify/build

v29.9.0

Compare Source

Features

• log number of user and generated functions for lambda to datadog (#​4963) (d8e81e3)

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[github-actions]

📊 Benchmark results

Comparing with cd6f33d

Package size: 264 MB

⬇️ 0.01% decrease vs. cd6f33d

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• T-30 (b4d888b): 263 MB
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• T (current commit): 264 MB