[pre-commit.ci] pre-commit autoupdate

updates:
- [github.com/PyCQA/isort: 5.9.1 → 5.9.3](PyCQA/isort@5.9.1...5.9.3)
- https://github.com/python/black → https://github.com/psf/black
- [github.com/psf/black: 21.6b0 → 21.7b0](psf/black@21.6b0...21.7b0)
- https://gitlab.com/pycqa/flake8 → https://github.com/PyCQA/flake8

Author: pre-commit-ci[bot]

.pre-commit-config.yaml

@@ -1,16 +1,16 @@
 repos:
   - repo: https://github.com/PyCQA/isort
-    rev: 5.9.1
+    rev: 5.9.3
     hooks:
       - id: isort
 
-  - repo: https://github.com/python/black
-    rev: 21.6b0
+  - repo: https://github.com/psf/black
+    rev: 21.7b0
     hooks:
       - id: black
         language_version: python3
 
-  - repo: https://gitlab.com/pycqa/flake8
+  - repo: https://github.com/PyCQA/flake8
     rev: 3.9.2
     hooks:
       - id: flake8