Update prek config to run ruffen-docs instead of blacken-docs

Author: amyreese

.pre-commit-config.yaml

@@ -115,20 +115,16 @@ repos:
           )$
         priority: 1
 
-  # Priority 2: blacken-docs runs after markdownlint-fix (both modify markdown).
-  - repo: https://github.com/adamchainz/blacken-docs
-    rev: 1.20.0
+  # Priority 2: ruffen-docs runs after markdownlint-fix (both modify markdown).
+  - repo: local
     hooks:
-      - id: blacken-docs
-        language: python # means renovate will also update `additional_dependencies`
-        args: ["--pyi", "--line-length", "130"]
-        files: '^crates/.*/resources/mdtest/.*\.md'
-        exclude: |
-          (?x)^(
-            .*?invalid(_.+)*_syntax\.md
-          )$
-        additional_dependencies:
-          - black==26.1.0
+      - id: ruffen-docs
+        name: Ruff markdown formatting
+        language: system
+        entry: cargo
+        args: ["run", "-p", "ruff", "format", "--preview", "--isolated", "--line-length", "130", "--extension", "py:pyi,python:pyi"]
+        files: '^crates/.*/resources/mdtest/.*\.md$'
+        pass_filenames: true
         priority: 2
 
   # `actionlint` hook, for verifying correct syntax in GitHub Actions workflows.