ci: pre-commit-config update

updates:
- [github.com/psf/black: 21.6b0 → 21.8b0](psf/black@21.6b0...21.8b0)
- [github.com/pycqa/isort: 5.9.1 → 5.9.3](PyCQA/isort@5.9.1...5.9.3)
- [github.com/asottile/pyupgrade: v2.19.4 → v2.26.0](asottile/pyupgrade@v2.19.4...v2.26.0)

.pre-commit-config.yaml

@@ -1,10 +1,10 @@
 repos:
 -   repo: https://github.com/psf/black
-    rev: 21.6b0
+    rev: 21.8b0
     hooks:
     - id: black
 -   repo: https://github.com/pycqa/isort
-    rev: 5.9.1
+    rev: 5.9.3
     hooks:
       - id: isort
         files: '.*'
@@ -17,7 +17,7 @@ repos:
             - flake8-comprehensions
         args: [ "--select=E9,F63,F7,F82,C4"]
 -   repo: https://github.com/asottile/pyupgrade
-    rev: v2.19.4
+    rev: v2.26.0
     hooks:
     -   id: pyupgrade
         args: ['--py36-plus','--exit-zero-even-if-changed']