[pre-commit.ci] pre-commit autoupdate
[pre-commit.ci] pre-commit autoupdate

updates:
- [github.com/asottile/pyupgrade: v2.14.0 → v2.15.0](https://github.com/asottile/pyupgrade/compare/v2.14.0...v2.15.0)
- [github.com/psf/black: 21.4b2 → 21.5b1](https://github.com/psf/black/compare/21.4b2...21.5b1)
- [github.com/PyCQA/flake8: 3.9.1 → 3.9.2](https://github.com/PyCQA/flake8/compare/3.9.1...3.9.2)
- [github.com/pre-commit/mirrors-prettier: v2.2.1 → v2.3.0](https://github.com/pre-commit/mirrors-prettier/compare/v2.2.1...v2.3.0)

nijel/photoblog,nijel/photoblog