This fixes a bug where a stale issue/PR that gets updated without a comment
remains stale indefinitely and never gets closed (actions/stale#715).
The only "breaking" change in that upadate is that the default close reason has
changed to "not planned". That seems like a more desirable default anyways.
By setting `ascending` to `true`, the most stale issues and PRs will be
caught first. By increasing the operations limit from the default (30)
to 250, more stale issues/PRs will be caught each run, increasing the
speed of the burndown.