[pre-commit.ci] pre-commit autoupdate (#342)

<!--pre-commit.ci start-->
updates:
- [github.com/asottile/blacken-docs: 1.16.0 →
1.18.0](adamchainz/blacken-docs@1.16.0...1.18.0)
<!--pre-commit.ci end-->

Author: pre-commit-ci[bot]

.pre-commit-config.yaml

@@ -32,7 +32,7 @@ repos:
         language_version: python3
 
   - repo: https://github.com/asottile/blacken-docs
-    rev: 1.16.0
+    rev: 1.18.0
     hooks:
       - id: blacken-docs
         additional_dependencies: [black==22.3.0]