[MNT] - Update actions

[TomDonoghue]

Updates actions versions

See the following on updating codecov (for actions v4):

• https://github.com/codecov/codecov-action?tab=readme-ov-file#breaking-changes
• https://docs.codecov.com/docs/adding-the-codecov-token#github-actions

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.27%. Comparing base (7d5e4ac) to head (fd53a4e).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #93   +/-   ##
=======================================
  Coverage   96.27%   96.27%           
=======================================
  Files          91       91           
  Lines        2900     2900           
=======================================
  Hits         2792     2792           
  Misses        108      108           

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