feat: allow renovate to update pre-commit hooks

Since many files under template/ are, well, templates it follows that they may not actually parse successfully as files containing dependencies.

The template/.pre-commit-config.yaml file is different in that it is not templated and so renovate can and should update it. Otherwise we have MRs like !148 (merged) which are forced to whack-a-mole updates.

This MR was tested locally and it was confirmed that the only file under templates/ which was detected to contain dependencies was templates/.pre-commit-config.yaml.

Closes #133 (closed)