Update to autoflake to 1.7.3

Fixes PyCQA/autoflake#168

Author: nicoddemus

.pre-commit-config.yaml

@@ -23,7 +23,7 @@ repos:
         exclude: _pytest/(debugging|hookspec).py
         language_version: python3
 -   repo: https://github.com/PyCQA/autoflake
-    rev: v1.7.2
+    rev: v1.7.3
     hooks:
     -   id: autoflake
         name: autoflake