Fix Transducers to last-compatible version in CI

[sethaxen]

This PR runs tests against older Transducer versions only to work around #144 breaking our CI. It should be reverted once JuliaFolds/Transducers.jl#557 is resolved, since it covers up potential future breakages

[codecov-commenter]

Codecov Report

Patch coverage has no change and project coverage change: -0.36 ⚠️

Comparison is base (0625b6d) 78.77% compared to head (46af5b5) 78.42%.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #146      +/-   ##
==========================================
- Coverage   78.77%   78.42%   -0.36%     
==========================================
  Files          13       13              
  Lines         570      570              
==========================================
- Hits          449      447       -2     
- Misses        121      123       +2     

see 1 file with indirect coverage changes

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