[pre-commit.ci] pre-commit autoupdate (#421)

updates:
- [github.com/asottile/blacken-docs: 1.15.0 → 1.16.0](adamchainz/blacken-docs@1.15.0...1.16.0)

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

.pre-commit-config.yaml

@@ -95,7 +95,7 @@ repos:
   hooks:
   - id: black
 - repo: https://github.com/asottile/blacken-docs
-  rev: 1.15.0
+  rev: 1.16.0
   hooks:
   - id: blacken-docs
     additional_dependencies: