[pre-commit.ci] pre-commit autoupdate (#434)

updates:
- [github.com/keewis/blackdoc: v0.3.8 → v0.3.9](keewis/blackdoc@v0.3.8...v0.3.9)

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

.pre-commit-config.yaml

@@ -15,7 +15,7 @@ repos:
       - id: black
 
   - repo: https://github.com/keewis/blackdoc
-    rev: v0.3.8
+    rev: v0.3.9
     hooks:
       - id: blackdoc