Reduce frequency of `pre-commit-ci` updates

[ns-rse]

Currently these are weekly and its an extra small thing to have to do each week. Reduce these to monthly in .pre-commit-config.yaml.

ci:
  autofix_prs: true
  autofix_commit_msg: '[pre-commit.ci] Fixing issues with pre-commit'
  autoupdate_schedule: monthly
  autoupdate_commit_msg: '[pre-commit.ci] pre-commit-autoupdate'
  skip: [pylint, pytest] # Optionally list ids of hooks to skip on CI