chore(deps): update actions/checkout action to v4

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
actions/checkout	action	major	v3 -> v4

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Release Notes

actions/checkout (actions/checkout)

v4

Compare Source

• Support fetching without the --progress option
• Update to node20

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Configuration

📅 Schedule: Branch creation - "every weekend" (UTC), Automerge - At any time (no schedule defined).

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

♻ Rebasing: Whenever PR is behind base branch, or you tick the rebase/retry checkbox.

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[github-actions]

PR checklist

Checklist:

• Is this release [v2.1.0] of Entitlement-Analyzer?
• Have you updated app/Entitlement-Analyzer.qvf?

If you wish to merge:

• Have this PR approved by a code owner
• Merge this PR into main
• Go to releases, an action will generate a draft release with docs + attached QVF
• Make any updates, then submit the release

Common issues:

• Version number missing or incorrect (./VERSION file needs updating)
• After merging, draft release doesn't update - this is usually because
  the action failed due to an old draft release with the same name.
  Delete the draft release, and re-run the action.