in tutorial, missing cast to int

[sryza]

From Nate Loker on slack:

Hey just a small thing but most of the sort_by_calories functions in the tutorial should be sorted_cereals = sorted(cereals, key=lambda cereal: int(cereal["calories"])) instead of sorted_cereals = sorted(cereals, key=lambda cereal: cereal["calories"]) (missing the int).

For example, on line 20 of input.py in the basics solids tutorial. https://docs.dagster.io/tutorial/basics_solids

https://dagster.slack.com/archives/CHJEUKYQM/p1605649765009200