Merge pull request #13078 from RasaHQ/prepare-release-3.6.21

Rasa 3.6.21 (2025-01-13)

Bugfixes

• #1424: Replace pickle and joblib with safer alternatives, e.g. json, safetensors, and skops, for
  serializing components.

  Note: This is a model breaking change. Please retrain your model.

  If you have a custom component that inherits from one of the components listed below and modified the persist or
  load method, make sure to update your code. Please contact us in case you encounter any problems.

  Affected components:

  • CountVectorFeaturizer
  • LexicalSyntacticFeaturizer
  • LogisticRegressionClassifier
  • SklearnIntentClassifier
  • DIETClassifier
  • CRFEntityExtractor
  • TrackerFeaturizer
  • TEDPolicy
  • UnexpectedIntentTEDPolicy