[pre-commit.ci] pre-commit autoupdate

updates:
- [github.com/asottile/blacken-docs: 1.18.0 → 1.19.0](adamchainz/blacken-docs@1.18.0...1.19.0)

Author: pre-commit-ci[bot]

.pre-commit-config.yaml

@@ -51,7 +51,7 @@ repos:
         types: [file, python]
 
 -   repo: https://github.com/asottile/blacken-docs
-    rev: 1.18.0
+    rev: 1.19.0
     hooks:
     -   id: blacken-docs
         types: [file, rst]