build(deps): Bump workflows to latest trusted versions

[hashicorp-tsccr[bot]]

Bumping GitHub Actions version to latest TSCCR release.

• changes in .github/workflows/add-copyright-headers.yml
  • bump actions/checkout from v4.1.4 to v4.1.6 (release notes)
• changes in .github/workflows/deploy.yml
  • bump actions/checkout from v4.1.4 to v4.1.6 (release notes)
• changes in .github/workflows/test.yml
  • bump actions/checkout from v4.1.4 to v4.1.6 (release notes)
  • bump actions/checkout from v4.1.4 to v4.1.6 (release notes)

This PR was auto-generated by security-tsccr/actions/runs/9250019710

You can alter the configuration of this automation via the hcl config in security-tsccr/automation

This PR can be regenerated by dispatching the GitHub workflow Pin Action Refs. Please reach out to #team-prodsec if you have any questions.

[github-actions[bot]]

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