[pre-commit.ci] pre-commit autoupdate (#459)

updates:
- [github.com/adamchainz/django-upgrade: 1.6.1 → 1.7.0](adamchainz/django-upgrade@1.6.1...1.7.0)

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

Author: pre-commit-ci[bot]

.pre-commit-config.yaml

@@ -9,7 +9,7 @@ repos:
         args: ["--py37-plus"]
 
   - repo: https://github.com/adamchainz/django-upgrade
-    rev: '1.6.1'
+    rev: '1.7.0'
     hooks:
       - id: django-upgrade
         args: [--target-version, "2.2"]