[pre-commit.ci] pre-commit autoupdate

updates:
- [github.com/psf/black: 21.7b0 → 21.8b0](psf/black@21.7b0...21.8b0)
- [github.com/asottile/pyupgrade: v2.24.0 → v2.25.0](asottile/pyupgrade@v2.24.0...v2.25.0)

Author: pre-commit-ci[bot]

.pre-commit-config.yaml

@@ -11,7 +11,7 @@ repos:
     hooks:
       - id: isort
   - repo: https://github.com/psf/black
-    rev: "21.7b0"
+    rev: "21.8b0"
     hooks:
       - id: black
   - repo: https://github.com/PyCQA/flake8
@@ -22,7 +22,7 @@ repos:
           - flake8-comprehensions
           - flake8-bugbear
   - repo: https://github.com/asottile/pyupgrade
-    rev: v2.24.0
+    rev: v2.25.0
     hooks:
     -   id: pyupgrade
         args: [--py36-plus]