[pre-commit.ci] pre-commit autoupdate (#635)

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)

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

Author: pre-commit-ci[bot]

.pre-commit-config.yaml

@@ -4,7 +4,7 @@ ci:
 
 repos:
 - repo: https://github.com/psf/black
-  rev: 21.7b0
+  rev: 21.8b0
   hooks:
   - id: black
     types: [file]
@@ -46,7 +46,7 @@ repos:
     additional_dependencies: [pyyaml]
 
 - repo: https://github.com/asottile/pyupgrade
-  rev: v2.24.0
+  rev: v2.25.0
   hooks:
   - id: pyupgrade
     args: [--py36-plus]