• Update CI to scikit-learn==1.8.0
  #1219
• When creating OrdinalExporter, respect infrequent categories attribute
  #1217
• Adds sklearn_is_fitted to CastTransformer
  #1209
• Fixes missing dimension (number of features) in StackingClassifier
  #1201
• Fixes CastTransformer output type
  #1200
• Fixes unknown_value=np.nan in OrdinalEncoder
  #1198
• Enhance OrdinalEncoder conversion to handle infrequent categories
  #1195
• Errors in validating Inputs and Outputs of operators raise
  dedicated exceptions instead of generic RuntimeError
  [#1205] (#1205)