⬆️ Update dependency blacken-docs to v1.15.0

Author: renovate[bot]

poetry.lock

@@ -33,7 +33,7 @@ pydantic = ">=1.10.8"
 [tool.poetry.group.dev.dependencies]
 aresponses = "2.1.6"
 black = "23.3.0"
-blacken-docs = "1.14.0"
+blacken-docs = "1.15.0"
 codespell = "2.2.5"
 covdefaults = "2.3.0"
 coverage = {version = "7.2.7", extras = ["toml"]}