Update actions/checkout action to v4 - autoclosed

[renovate]

This PR contains the following updates:

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

---

Release Notes

actions/checkout (actions/checkout)

v4

Compare Source

• url-helper.ts now leverages well-known environment variables by @​jww3 in https://github.com/actions/checkout/pull/1941
• Expand unit test coverage for isGhes by @​jww3 in https://github.com/actions/checkout/pull/1946

---

Configuration

📅 Schedule: Branch creation - At any time (no schedule defined), 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.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

---

• If you want to rebase/retry this PR, check this box

---

This PR was generated by Mend Renovate. View the repository job log.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.44%. Comparing base (c2b6836) to head (b35260b).
Report is 60 commits behind head on main.

❗ Current head b35260b differs from pull request most recent head 8d712d8

Please upload reports for the commit 8d712d8 to get more accurate results.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #721   +/-   ##
=======================================
  Coverage   81.44%   81.44%           
=======================================
  Files           3        3           
  Lines         345      345           
=======================================
  Hits          281      281           
  Misses         40       40           
  Partials       24       24           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.