Fix CompatHelper

[devmotion]

#120 broke CompatHelper: https://github.com/TuringLang/MCMCDiagnosticTools.jl/actions/workflows/CompatHelper.yml This PR fixes the problem.

Manual CompatHelper run with this PR: https://github.com/TuringLang/MCMCDiagnosticTools.jl/actions/runs/7927222152/job/21643245417

[coveralls]

Pull Request Test Coverage Report for Build 7927227940

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 96.579%

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Totals
Change from base Build 7904148859:	0.0%
Covered Lines:	847
Relevant Lines:	877

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💛 - Coveralls

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (c460b8c) 96.68% compared to head (0378e61) 96.68%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #121   +/-   ##
=======================================
  Coverage   96.68%   96.68%           
=======================================
  Files          11       11           
  Lines         876      876           
=======================================
  Hits          847      847           
  Misses         29       29           

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