Update action versions in process.yml workflows

[timothy-nunn]

Updates the versions of actions we use in our CI. Some of these were causing warnings due to deprecation.

The .coverage artifact was causing a warning due to the fact it does not exist.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 29.54%. Comparing base (f834c69) to head (c39f3c7).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3428   +/-   ##
=======================================
  Coverage   29.54%   29.54%           
=======================================
  Files          78       78           
  Lines       19143    19143           
=======================================
  Hits         5656     5656           
  Misses      13487    13487           

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