Fix OrderedDictionary STON support for GS64

[gcotelli]

Also

• Update checkout action version

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (1ea8fd3) to head (1f96b89).
Report is 3 commits behind head on release-candidate.

Additional details and impacted files

@@                 Coverage Diff                 @@
##           release-candidate      #117   +/-   ##
===================================================
  Coverage             100.00%   100.00%           
===================================================
  Files                     80        81    +1     
  Lines                   7371      7403   +32     
===================================================
+ Hits                    7371      7403   +32     

Flag	Coverage Δ
unit	100.00% <100.00%> (ø)

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