Ran pre-commit autoupdate.

Committed via https://github.com/asottile/all-repos

.pre-commit-config.yaml

 -   repo: https://github.com/pre-commit/pre-commit-hooks
-    sha: v0.7.1
+    sha: v0.9.1
     hooks:
     -   id: trailing-whitespace
     -   id: end-of-file-fixer
@@ -11,7 +11,7 @@
     -   id: requirements-txt-fixer
     -   id: flake8
 -   repo: https://github.com/asottile/reorder_python_imports
-    sha: v0.3.1
+    sha: v0.3.5
     hooks:
     -   id: reorder-python-imports
 -   repo: https://github.com/asottile/add-trailing-comma