Update auto-check workflow: bump checkout to v6 and use DAPPNODE_ACTIONS_PR_CREATOR token

[Copilot]

Updates the auto-check workflow to use the latest checkout action version and the proper DAppNode actions token for PR creation.

Changes

• Bump actions/checkout from v4 to v6
• Replace secrets.GITHUB_TOKEN with secrets.DAPPNODE_ACTIONS_PR_CREATOR for the workflow token

-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - run: npx @dappnode/dappnodesdk github-action bump-upstream --use-variants
         env:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          GITHUB_TOKEN: ${{ secrets.DAPPNODE_ACTIONS_PR_CREATOR }}

Original prompt

Repository: dappnode/DAppNodePackage-nethermind-generic

Create a pull request updating .github/workflows/auto_check.yml with:

1. Bump actions/checkout to v6.
2. Set env GITHUB_TOKEN to ${{ secrets.DAPPNODE_ACTIONS_PR_CREATOR }}.

Acceptance criteria:

• Only .github/workflows/auto_check.yml is changed unless strictly necessary.
• YAML remains valid.
• PR title/description summarize both changes.

This pull request was created from Copilot chat.

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