ci: pin Node.js 25.6.1 (#733) #141

Job	Run time
ci-package-manager / build-tarball	26s
ci-package-manager / npm-install	11s
ci-package-manager / yarn-v1-install	7s
ci-package-manager / bun-install	6s
ci-package-manager / yarn-install	12s
ci-package-manager / pnpm-install	10s
	1m 12s

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