[pre-commit.ci] pre-commit autoupdate (#5374)

updates:
- [github.com/asottile/blacken-docs: 1.14.0 → 1.15.0](adamchainz/blacken-docs@1.14.0...1.15.0)

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

.pre-commit-config.yaml

@@ -56,7 +56,7 @@ repos:
         args: [--filter-files]
 
 -   repo: https://github.com/asottile/blacken-docs
-    rev: 1.14.0
+    rev: 1.15.0
     hooks:
     -   id: blacken-docs
         types: [file, rst]