chore: fix r test flakiness

[mhamilton723]

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[mhamilton723]

/azp run

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[codecov-commenter]

Codecov Report

Merging #1314 (be254f2) into master (b268271) will increase coverage by 0.08%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1314      +/-   ##
==========================================
+ Coverage   84.67%   84.76%   +0.08%     
==========================================
  Files         280      280              
  Lines       13641    13641              
  Branches      693      693              
==========================================
+ Hits        11551    11563      +12     
+ Misses       2090     2078      -12     

Impacted Files	Coverage Δ
...re/synapse/ml/lightgbm/params/LightGBMParams.scala	84.09% <0.00%> (-0.38%)	⬇️
...crosoft/azure/synapse/ml/lightgbm/TrainUtils.scala	85.98% <0.00%> (+2.54%)	⬆️
...crosoft/azure/synapse/ml/io/http/HTTPClients.scala	73.33% <0.00%> (+15.00%)	⬆️

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[mhamilton723]

/azp run

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Azure Pipelines successfully started running 1 pipeline(s).