Use latest tagged version of go-statemachine

[gammazero]

Uses the same commit, just refers to the tagged version of go-statemachine (with leak fix).

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 61.38%. Comparing base (d846bbb) to head (06882d2).
Report is 16 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #319      +/-   ##
==========================================
+ Coverage   61.34%   61.38%   +0.03%     
==========================================
  Files          30       30              
  Lines        3182     3180       -2     
==========================================
  Hits         1952     1952              
+ Misses       1001      999       -2     
  Partials      229      229              

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