[pre-commit.ci] pre-commit autoupdate (#896)

updates:
- [github.com/asottile/blacken-docs: 1.13.0 → 1.14.0](adamchainz/blacken-docs@1.13.0...1.14.0)

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

.pre-commit-config.yaml

@@ -6,7 +6,7 @@ repos:
         args: ["--target-version=py37"]
 
   - repo: https://github.com/asottile/blacken-docs
-    rev: 1.13.0
+    rev: 1.14.0
     hooks:
       - id: blacken-docs
         args: ["--target-version=py37"]