fix: explicitly convert parameter bounds to list of tuples

[alexander-held]

A bug fix in typeguard 4.2.0 started flagging a type inconsistency where model.config.suggested_bounds() contains elements that are lists instead of tuples with custom parameter bound configuration, see scikit-hep/pyhf#2462. This fix here works around this by explicitly converting to a list of tuples for further use within cabinetry.

If the behavior in pyhf changes, this should be reverted / adjusted in the future.

* convert parameter bounds to list of tuples for consistent types when custom bounds are used

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (f116d4e) to head (768074e).

Additional details and impacted files

@@            Coverage Diff            @@
##            master      #471   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files           22        22           
  Lines         2093      2093           
  Branches       344       346    +2     
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  Hits          2093      2093           

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