v2.12.13

• Prevent returning an empty list for ClassDef.slots() when the mro list contains one class & it is not object.

  Refs pylint-dev/pylint#5099

• Prevent a crash when inferring calls to str.format with inferred arguments
  that would be invalid.

  Closes #1856

• Infer the length argument of the random.sample function.

  Refs pylint-dev/pylint#7706

• Catch ValueError when indexing some builtin containers and sequences during inference.

  Closes #1843