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[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

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

Additional details and impacted files

```diff @@ 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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