Update auto_check.yml: bump checkout to v6 and use dedicated PR token

[Copilot]

Updates the auto_check workflow to use the latest checkout action and a dedicated token for PR creation.

Changes

• Bump actions/checkout@v4 → v6
• Use secrets.DAPPNODE_ACTIONS_PR_CREATOR instead of secrets.GITHUB_TOKEN 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-prysm-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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