chore(deps): update pre-commit hook asottile/add-trailing-comma to v4

Author: renovate[bot]

.pre-commit-config.yaml

@@ -91,7 +91,7 @@ repos:
         args: [--py38-plus]
         exclude: nonunicode/.*
   - repo: https://github.com/asottile/add-trailing-comma
-    rev: v3.1.0
+    rev: v4.0.0
     hooks:
       - id: add-trailing-comma
         exclude: nonunicode/.*