[pre-commit.ci] pre-commit autoupdate (#27)

updates:
- [github.com/pycqa/isort: 5.8.0 → 5.9.1](PyCQA/isort@5.8.0...5.9.1)
- [github.com/psf/black: 21.5b1 → 21.6b0](psf/black@21.5b1...21.6b0)
- [github.com/pre-commit/mirrors-mypy: v0.812 → v0.902](pre-commit/mirrors-mypy@v0.812...v0.902)

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

.pre-commit-config.yaml

@@ -1,17 +1,17 @@
 repos:
   - repo: https://github.com/pycqa/isort
-    rev: 5.8.0
+    rev: 5.9.1
     hooks:
       - id: isort
   - repo: https://github.com/psf/black
-    rev: 21.5b1
+    rev: 21.6b0
     hooks:
       - id: black
   - repo: https://github.com/PyCQA/flake8
     rev: 3.9.2
     hooks:
       - id: flake8
   - repo: https://github.com/pre-commit/mirrors-mypy
-    rev: "v0.812"
+    rev: "v0.902"
     hooks:
       - id: mypy