[pre-commit.ci] pre-commit autoupdate (#23)

updates:
- [github.com/asottile/pyupgrade: v2.24.0 → v2.26.0](asottile/pyupgrade@v2.24.0...v2.26.0)
- [github.com/psf/black: 21.7b0 → 21.8b0](psf/black@21.7b0...21.8b0)

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

.pre-commit-config.yaml

@@ -10,15 +10,15 @@ repos:
       - id: end-of-file-fixer
       - id: trailing-whitespace
   - repo: https://github.com/asottile/pyupgrade
-    rev: v2.24.0
+    rev: v2.26.0
     hooks:
       - id: pyupgrade
   - repo: https://github.com/PyCQA/isort
     rev: 5.9.3
     hooks:
       - id: isort
   - repo: https://github.com/psf/black
-    rev: 21.7b0
+    rev: 21.8b0
     hooks:
       - id: black
         args: [--safe]