StepFunctions: Support Version Descriptions

[bblommers]

Fixes #8453

[codecov]

Codecov Report

Attention: Patch coverage is 93.75000% with 1 line in your changes missing coverage. Please review.

Project coverage is 92.62%. Comparing base (9fa5890) to head (1737957).
Report is 15 commits behind head on master.

Files with missing lines	Patch %	Lines
moto/stepfunctions/responses.py	88.88%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #8466   +/-   ##
=======================================
  Coverage   92.62%   92.62%           
=======================================
  Files        1225     1225           
  Lines      105633   105696   +63     
=======================================
+ Hits        97843    97905   +62     
- Misses       7790     7791    +1     

Flag	Coverage Δ
servertests	27.75% <12.50%> (-0.01%)	⬇️
unittests	92.60% <93.75%> (+<0.01%)	⬆️

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