[pre-commit.ci] pre-commit autoupdate

updates:
- [github.com/asottile/pyupgrade: v3.20.0 → v3.21.0](asottile/pyupgrade@v3.20.0...v3.21.0)

Author: pre-commit-ci[bot]

.pre-commit-config.yaml

@@ -6,7 +6,7 @@ repos:
       args: [--target-version, "4.2"]
 
 - repo: https://github.com/asottile/pyupgrade
-  rev: v3.20.0
+  rev: v3.21.0
   hooks:
     - id: pyupgrade
       args: [--py39-plus]