ci: bump actions/setup-node from 4 to 6 - #638

Warning: Code scanning cannot determine the alerts introduced by this pull request, because 3 configurations present on refs/heads/main were not found:

Default setup

• ❓  /language:actions
• ❓  /language:python

Actions workflow (security-scan.yml)

• ❓  .github/workflows/security-scan.yml:codeql/language:python

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