[pre-commit.ci] pre-commit autoupdate

updates:
- [github.com/asottile/pyupgrade: v2.21.0 → v2.21.2](https://github.com/asottile/pyupgrade/compare/v2.21.0...v2.21.2)

.pre-commit-config.yaml

diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 4eb0aef..a2e4c9b 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -27,7 +27,7 @@
     -   id: reorder-python-imports
         args: [--py3-plus]
 -   repo: https://github.com/asottile/pyupgrade
-    rev: v2.21.0
+    rev: v2.21.2
     hooks:
     -   id: pyupgrade
         args: [--py36-plus]