Auto-update pre-commit hooks (backport #362) (#364)

Author: mergify[bot]

.pre-commit-config.yaml

@@ -43,7 +43,7 @@ repos:
 
   # Python hooks
   - repo: https://github.com/asottile/pyupgrade
-    rev: v3.21.1
+    rev: v3.21.2
     hooks:
       - id: pyupgrade
         args: [--py36-plus]