CompatHelper: bump compat for DynamicPPL to 0.31 for package test, (keep existing compat)

[github-actions]

This pull request changes the compat entry for the DynamicPPL package from 0.29, 0.30.2 to 0.29, 0.30.2, 0.31 for package test.
This keeps the compat entries for earlier versions.

Note: I have not tested your package with this new compat entry.
It is your responsibility to make sure that your package tests pass before you merge this pull request.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.41%. Comparing base (f3b2476) to head (6d25449).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2407   +/-   ##
=======================================
  Coverage   86.41%   86.41%           
=======================================
  Files          22       22           
  Lines        1575     1575           
=======================================
  Hits         1361     1361           
  Misses        214      214           

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[coveralls]

Pull Request Test Coverage Report for Build 12092053453

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 78.585%

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Totals
Change from base Build 12082865030:	0.0%
Covered Lines:	1233
Relevant Lines:	1569

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💛 - Coveralls