First invoke task: uses pip-compile to update the versions of all the
pip packages in requirements.txt and requirements-dev.txt. It also
post-processes the output file and removes any comments that have a "-r"
reference in them, since those currently cause Salt to break (and are
kind of redundant anyway).
Unfortunately, as part of writing this I discovered that invoke can't
handle type annotations in the definitions of its task functions, so I
had to exclude tasks.py from being checked by mypy. That makes me a
little nervous about whether invoke is still being maintained. Relevant
issue (over 4 years old): https://github.com/pyinvoke/invoke/issues/357
Deimos
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