Bump copier from 9.14.1 to 9.15.2

Bumps [copier](https://github.com/copier-org/copier) from 9.14.1 to 9.15.2.
- [Release notes](https://github.com/copier-org/copier/releases)
- [Changelog](https://github.com/copier-org/copier/blob/master/CHANGELOG.md)
- [Commits](copier-org/copier@v9.14.1...v9.15.2)

---
updated-dependencies:
- dependency-name: copier
  dependency-version: 9.15.2
  dependency-type: direct:production
...

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Author: dependabot[bot]