Prepare to move to scikit-learn 0.24

[mfeurer]

No description provided.

[codecov]

Codecov Report

Merging #1024 (9c12762) into development (ef9ef49) will increase coverage by 0.15%.
The diff coverage is 95.70%.

@@               Coverage Diff               @@
##           development    #1024      +/-   ##
===============================================
+ Coverage        85.41%   85.56%   +0.15%     
===============================================
  Files              125      127       +2     
  Lines             9891    10151     +260     
===============================================
+ Hits              8448     8686     +238     
- Misses            1443     1465      +22     

Impacted Files	Coverage Δ
autosklearn/experimental/askl2.py	84.03% <ø> (+2.11%)	⬆️
...ine/components/feature_preprocessing/kernel_pca.py	94.73% <ø> (ø)
...osklearn/pipeline/components/classification/mlp.py	94.95% <94.95%> (ø)
autosklearn/pipeline/components/regression/mlp.py	95.86% <95.86%> (ø)
autosklearn/automl.py	84.72% <100.00%> (-0.16%)	⬇️
autosklearn/evaluation/abstract_evaluator.py	88.61% <100.00%> (+0.18%)	⬆️
autosklearn/metalearning/metalearning/meta_base.py	88.00% <100.00%> (+0.16%)	⬆️
autosklearn/pipeline/classification.py	86.88% <100.00%> (ø)
...ata_preprocessing/category_shift/category_shift.py	95.65% <100.00%> (ø)
...preprocessing/imputation/categorical_imputation.py	95.83% <100.00%> (ø)
... and 13 more

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