remove unused env var

[lightwalker-eth]

Background info: https://namehash.slack.com/archives/C086Z6FNBHN/p1768293970217589?thread_ts=1768263675.587389&cid=C086Z6FNBHN

[changeset-bot]

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Latest commit: 091cd36

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Project	Deployment	Review	Updated (UTC)
admin.ensnode.io	Ready	Preview, Comment	Jan 13, 2026 8:53am
ensnode.io	Ready	Preview, Comment	Jan 13, 2026 8:53am
ensrainbow.io	Ready	Preview, Comment	Jan 13, 2026 8:53am

[Copilot]

Pull request overview

This PR removes the unused NPM_TOKEN environment variable from the GitHub Actions release workflow. The comment on line 72 references a GitHub issue explaining that NODE_AUTH_TOKEN should be used instead of NPM_TOKEN for the changesets action. Since NODE_AUTH_TOKEN is already configured with the NPM token secret, the NPM_TOKEN variable is redundant.

Changes:

• Removed redundant NPM_TOKEN environment variable from the changesets action step

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