[pre-commit.ci] pre-commit autoupdate

[pre-commit-ci[bot]]

updates:

• github.com/PyCQA/autoflake: v1.5.3 → v1.6.1
• github.com/asottile/pyupgrade: v2.37.3 → v2.38.2
• github.com/pre-commit/mirrors-mypy: v0.971 → v0.981