⬆️🪝 Update pre-commit hook adamchainz/blacken-docs to v1.19.0 (#480)

Author: renovate[bot]

.pre-commit-config.yaml

@@ -67,7 +67,7 @@ repos:
 
   # Also run Black on examples in the documentation
   - repo: https://github.com/adamchainz/blacken-docs
-    rev: 1.18.0
+    rev: 1.19.0
     hooks:
       - id: blacken-docs
         additional_dependencies: [black==24.*]