chore(deps-dev): bump the development-dependencies group with 3 updates

Bumps the development-dependencies group with 3 updates: [copier](https://github.com/copier-org/copier), [mypy](https://github.com/python/mypy) and [ruff](https://github.com/astral-sh/ruff).


Updates `copier` from 9.12.0 to 9.14.1
- [Release notes](https://github.com/copier-org/copier/releases)
- [Changelog](https://github.com/copier-org/copier/blob/master/CHANGELOG.md)
- [Commits](copier-org/copier@v9.12.0...v9.14.1)

Updates `mypy` from 1.19.1 to 1.20.0
- [Changelog](https://github.com/python/mypy/blob/master/CHANGELOG.md)
- [Commits](python/mypy@v1.19.1...v1.20.0)

Updates `ruff` from 0.15.4 to 0.15.8
- [Release notes](https://github.com/astral-sh/ruff/releases)
- [Changelog](https://github.com/astral-sh/ruff/blob/main/CHANGELOG.md)
- [Commits](astral-sh/ruff@0.15.4...0.15.8)

---
updated-dependencies:
- dependency-name: copier
  dependency-version: 9.14.1
  dependency-type: direct:development
  update-type: version-update:semver-minor
  dependency-group: development-dependencies
- dependency-name: mypy
  dependency-version: 1.20.0
  dependency-type: direct:development
  update-type: version-update:semver-minor
  dependency-group: development-dependencies
- dependency-name: ruff
  dependency-version: 0.15.8
  dependency-type: direct:development
  update-type: version-update:semver-patch
  dependency-group: development-dependencies
...

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Author: dependabot[bot]