Bump blacken-docs from 1.12.0 to 1.12.1

Bumps [blacken-docs](https://github.com/asottile/blacken-docs) from 1.12.0 to 1.12.1.
- [Release notes](https://github.com/asottile/blacken-docs/releases)
- [Commits](adamchainz/blacken-docs@v1.12.0...v1.12.1)

---
updated-dependencies:
- dependency-name: blacken-docs
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

pyproject.toml

@@ -33,7 +33,7 @@ yarl = ">=1.6.0"
 [tool.poetry.dev-dependencies]
 aresponses = "^2.1.5"
 black = "^21.12b0"
-blacken-docs = "^1.12.0"
+blacken-docs = "^1.12.1"
 coverage = {version = "^6.3", extras = ["toml"]}
 flake8 = "^4.0.1"
 flake8-docstrings = "^1.6.0"