Remove mock from dev-requirements.
Review Request #12776 — Created Jan. 10, 2023 and submitted — Latest diff uploaded
With the recent changes to the actions unit tests, we no longer have any
dependency on the mock library. We can therefore remove it from
dev-requirements.txt.There is still some mock usage in djblets, but that has its own
dev-requirements file that still lists it.
Ran unit tests.