FEAT: add option to outsource requirements schedule

[redeboer]

If a repository uses pre-commit.ci, it will always have a cron schedule job for updating .pre-commit-config.yaml. PRs created by this cron job will then trigger to the requirements workflow if available, so there is no need to have that workflow also have its own cron schedule.

Set --pin-requirements=outsource to remove the schedule from the requirements.yml workflow.

Warning

Note this only triggers a PR if there updates to the pre-commit hooks. This is less frequently the case than that there are updates in all the indirect dependencies.