feat: bump actions-checkout to v4 and fix config test error

[jonesho]

This PR implements issue(s) #181

Checklist

• I wrote new tests for my new core changes.
• I have successfully ran tests, style checker and build against my new changes locally.
• I have informed the team of any breaking changes if there are any.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 71.61%. Comparing base (99583ae) to head (d040714).

Additional details and impacted files

@@            Coverage Diff            @@
##               main     #246   +/-   ##
=========================================
  Coverage     71.61%   71.61%           
  Complexity     1084     1084           
=========================================
  Files           299      299           
  Lines         12145    12145           
  Branches       1083     1083           
=========================================
  Hits           8698     8698           
  Misses         2956     2956           
  Partials        491      491           

Flag	Coverage Δ		*Carryforward flag
hardhat	98.67% <ø> (ø)		Carriedforward from 99583ae
kotlin	69.43% <ø> (ø)

*This pull request uses carry forward flags. Click here to find out more.