While the idea of cleaning up the the PRs list by nudging reviewers
with the stale message and closing PRs that didn't got a review in time
cloud work for the maintainers, in practice it discourages contributors
to submit contributions.

Keeping PRs open and not providing feedback also doesn't help with
contributors motivation, so while I'm disabling this feature of the bot
we still need to come up with a process that will help us to keep
the number of PRs in check, but celebrate the work contributors already
did instead of ignoring it, or dismissing in the form of a "stale"
alerts, and automatically closing PRs.