[pre-commit.ci] pre-commit autoupdate (#184)

* [pre-commit.ci] pre-commit autoupdate

updates:
- [github.com/asottile/blacken-docs: 960ead214cd1184149d366c6d27ca6c369ce46b6 → 4c97c4a0d921007af6fefae92d8447cfbf63720b](adamchainz/blacken-docs@960ead2...4c97c4a)
- [github.com/pre-commit/mirrors-prettier: ffb6a759a979008c0e6dff86e39f4745a2d9eac4 → f12edd9c7be1c20cfa42420fd0e6df71e42b51ea](pre-commit/mirrors-prettier@ffb6a75...f12edd9)

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

* Update .pre-commit-config.yaml

---------

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

Author: pre-commit-ci[bot]

.pre-commit-config.yaml

@@ -19,7 +19,7 @@ repos:
       - id: trailing-whitespace
 
   - repo: https://github.com/asottile/blacken-docs
-    rev: 960ead214cd1184149d366c6d27ca6c369ce46b6 # frozen: 1.16.0
+    rev: 4c97c4a0d921007af6fefae92d8447cfbf63720b # frozen: 1.18.0
     hooks:
       - id: blacken-docs