[pre-commit.ci] pre-commit autoupdate

updates:
- [github.com/asottile/pyupgrade: v3.15.2 → v3.16.0](asottile/pyupgrade@v3.15.2...v3.16.0)
- [github.com/adamchainz/django-upgrade: 1.16.0 → 1.18.0](adamchainz/django-upgrade@1.16.0...1.18.0)

.pre-commit-config.yaml

@@ -18,12 +18,12 @@ repos:
     hooks:
       - id: isort
   - repo: https://github.com/asottile/pyupgrade
-    rev: v3.15.2
+    rev: v3.16.0
     hooks:
     -   id: pyupgrade
         args: [--py37-plus]
   - repo: https://github.com/adamchainz/django-upgrade
-    rev: 1.16.0
+    rev: 1.18.0
     hooks:
     - id: django-upgrade
       args: [--target-version, "3.2"]