chore: update pre-commit hooks (#72)

<!--pre-commit.ci start-->
updates:
- [github.com/asottile/blacken-docs: 1.18.0 →
1.19.0](adamchainz/blacken-docs@1.18.0...1.19.0)
<!--pre-commit.ci end-->

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

.pre-commit-config.yaml

@@ -44,7 +44,7 @@ repos:
   # Documentation files
 
   - repo: https://github.com/asottile/blacken-docs
-    rev: "1.18.0"
+    rev: "1.19.0"
     hooks:
       - id: blacken-docs
         additional_dependencies: [black==23.7.0]