[pre-commit.ci] pre-commit autoupdate (#178)

<!--pre-commit.ci start-->
updates:
- [github.com/adamchainz/django-upgrade: 1.15.0 →
1.16.0](adamchainz/django-upgrade@1.15.0...1.16.0)
<!--pre-commit.ci end-->

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

.pre-commit-config.yaml

@@ -33,7 +33,7 @@ repos:
   - id: pyupgrade
     args: [--py38-plus]
 - repo: https://github.com/adamchainz/django-upgrade
-  rev: 1.15.0
+  rev: 1.16.0
   hooks:
   - id: django-upgrade
     args: [--target-version, '3.2']