ci: refactor and upgrade actions

[artus9033]

Describe your changes

This PR introduces the following:

• upgrades codecov/codecov-action from v3 to v4 in ci.yml
• refactors ci.yml to use an env var for node version

Linked issues (if any)

N/A

Checklist before requesting a review

• E2E tests' snapshots (screenshots) are up-to-date
• documentation is up-to-date

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.68%. Comparing base (92a363e) to head (47f8d81).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #144   +/-   ##
=======================================
  Coverage   92.68%   92.68%           
=======================================
  Files           1        1           
  Lines         205      205           
  Branches       78       78           
=======================================
  Hits          190      190           
  Misses         15       15           

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