Merge pull request #678 from pytest-dev/pre-commit-ci-update-config

[pre-commit.ci] pre-commit autoupdate

Author: nicoddemus

.pre-commit-config.yaml

@@ -17,7 +17,7 @@ repos:
     hooks:
     -   id: flake8
 -   repo: https://github.com/asottile/pyupgrade
-    rev: v2.19.4
+    rev: v2.21.0
     hooks:
     -   id: pyupgrade
         args: [--py3-plus]