build(deps): bump actions/setup-node from 4 to 6

dependabot[bot]

24.37.2026 5cd6fa04596adc7d6f1291de098d06b182d9e8b0

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[build]
publish = "public"
command = "hugo --environment documentation --gc --minify"
[build.environment]
HUGO_VERSION = "0.160.0"
HUGO_ENV = "documentation"
GO_VERSION = "1.23"
NODE_ENV = "development"