fix(deps): update dependency @netlify/build to ^26.2.6

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@netlify/build	^26.2.5 -> ^26.2.6

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Release Notes

netlify/build

v26.2.6

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[github-actions]

📊 Benchmark results

Comparing with 072b624

Package size: 440 MB

(no change)

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• T-30 (072b624): 440 MB
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• T-9 (06f0d95): 377 MB
• T-8 (a1dc7a4): 368 MB
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• T-4 (6424921): 368 MB
• T-3 (9902ec0): 368 MB
• T-2 (fb4fd7a): 368 MB
• T-1 (b557a4d): 368 MB
• T (current commit): 440 MB