[pre-commit.ci] pre-commit autoupdate

updates:
- [github.com/psf/black: 21.4b0 → 21.4b2](https://github.com/psf/black/compare/21.4b0...21.4b2)
- [github.com/asottile/pyupgrade: v2.13.0 → v2.14.0](https://github.com/asottile/pyupgrade/compare/v2.13.0...v2.14.0)