bd4c5503dd
A bunch of modern packages (`pytest`, `twisted`, `automat`) all need `attrs==19.2.0` (or newer). We _could_ bump `attrs` all the way to the modern `21.4.0` version, but I'd like to defer that upgrade risk, since there's a lot of backwards-incompatible changes and deprecations. So, lightly bump it to `19.2.0`. As part of bumping it, `pytest` is no longer compatible. The earliest candidate that seems to be compatible is `pytest` 4.6.6, which boasts in its release notes that it's resolved some deprecation warnings against `attrs>=19.2.0`. Once `pytest` was bumped, it needed a newer version of `pluggy`, which itself has dependencies. Since we're using hashes in `tox_requirements.txt`, all dependencies needed to be hashed as well. Differential Revision: https://phabricator.services.mozilla.com/D135178
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