fix(deps): update netlify packages

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@netlify/build	^28.1.5 -> ^28.1.9
@netlify/config	^19.1.1 -> ^19.1.2
netlify-headers-parser	^7.0.0 -> ^7.0.1

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[github-actions]

📊 Benchmark results

Comparing with ba37074

Package size: 242 MB

⬇️ 2.40% decrease vs. ba37074

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Legend

• T-14 (a9acd6f): 241 MB
• T-13 (423be8f): 241 MB
• T-12 (01db7db): 245 MB
• T-11 (f850cfb): 241 MB
• T-10 (40f7ea0): 241 MB
• T-9 (678e979): 241 MB
• T-8 (36957fc): 247 MB
• T-7 (0415efe): 247 MB
• T-6 (1ab07f0): 247 MB
• T-5 (9741537): 247 MB
• T-4 (54a2d73): 247 MB
• T-3 (ec45d2b): 247 MB
• T-2 (705a1b2): 248 MB
• T-1 (ba37074): 248 MB
• T (current commit): 242 MB