chore: update black in precommit to match dependabot upgrade

bchew · web-flow · commit a0f815938cda · 2021-09-21T22:04:19.000+10:00
diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
@@ -1,6 +1,6 @@
 repos:
   - repo: https://github.com/ambv/black
-    rev: 21.8b0
+    rev: 21.9b0
     hooks:
       - id: black
         language_version: python3.9
