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

---

Release Notes

actions/checkout (actions/checkout)

v4

Compare Source

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

---

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 becomes conflicted, 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 has been generated by Mend Renovate. View repository job log here.

[codecov]

Codecov Report

Merging #287 (2bfb66f) into main (6f6f79c) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #287   +/-   ##
=======================================
  Coverage   93.45%   93.45%           
=======================================
  Files           5        5           
  Lines         550      550           
  Branches      102      102           
=======================================
  Hits          514      514           
  Misses         36       36