Changelog:

• cloudpickle's pickle.Pickler subclass (currently defined as cloudpickle.cloudpickle_fast.CloudPickler) can and should now be accessed as cloudpickle.Pickler. This is the only officially supported way of accessing it.
• cloudpickle now supports pickling dict_keys, dict_items and dict_values.

Signed-off-by: Algent Albrahimi <algent@protonmail.com>

• Update python-spyder-kernels against this version.
• Run a few python scripts using spyder3.
• Run this example using cli:

>>> import cloudpickle
>>> squared = lambda x: x ** 2
>>> pickled_lambda = cloudpickle.dumps(squared)
>>> import pickle
>>> new_squared = pickle.loads(pickled_lambda)
>>> new_squared(2)
4
>>> CONSTANT = 42
>>> def my_function(data: int) -> int:
...     return data + CONSTANT
... 
>>> pickled_function = cloudpickle.dumps(my_function)
>>> depickled_function = pickle.loads(pickled_function)
>>> depickled_function(43)
85
>>>