CompatHelper: bump compat for DynamicPPL in [extras] to 0.39, (keep existing compat)

[github-actions]

This pull request changes the compat entry for the DynamicPPL package from 0.21 - 0.37 to 0.21 - 0.37, 0.39.
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.

[github-actions]

ParetoSmooth.jl documentation for PR #129 is available at:
https://TuringLang.github.io/ParetoSmooth.jl/previews/PR129/

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.10%. Comparing base (d42362a) to head (3fe2f7f).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #129      +/-   ##
==========================================
- Coverage   85.56%   85.10%   -0.47%     
==========================================
  Files          11       11              
  Lines         395      376      -19     
==========================================
- Hits          338      320      -18     
+ Misses         57       56       -1     

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