[pre-commit.ci] pre-commit autoupdate

updates:
- [github.com/keewis/blackdoc: v0.3.9 → v0.4.0](keewis/blackdoc@v0.3.9...v0.4.0)

Author: pre-commit-ci[bot]

.pre-commit-config.yaml

@@ -15,7 +15,7 @@ repos:
       - id: black
 
   - repo: https://github.com/keewis/blackdoc
-    rev: v0.3.9
+    rev: v0.4.0
     hooks:
       - id: blackdoc