Allow hierarchical sort to keep simple items first

[nyurik]

When performing a hierarchical sort on a yaml file, I would like to be able to keep the keys with the deeply nested values after the ones with just a simple string/number value to improve readability:

repos:
  - repo: https://github.com/pre-commit/pre-commit-hooks
    rev: v5.0.0
    hooks:
      - id: check-added-large-files
      - id: check-executables-have-shebangs
      - id: check-json

rather than the current result of this:

repos:
  - repo: https://github.com/pre-commit/pre-commit-hooks
    hooks:
      - id: check-added-large-files
      - id: check-executables-have-shebangs
      - id: check-json
    rev: v5.0.0   # <----------------this gets moved to the end