[pre-commit.ci] pre-commit autoupdate (#483)

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

Author: pre-commit-ci[bot]

.pre-commit-config.yaml

@@ -20,7 +20,7 @@ repos:
       - --line-length=88
 
 - repo: https://github.com/keewis/blackdoc
-  rev: v0.3.9
+  rev: v0.4.0
   hooks:
   - id: blackdoc
     files: '\.py$'