Update dependency black to v26 [SECURITY]

Author: renovate[bot]

pyproject.toml

@@ -35,7 +35,7 @@ yarl = ">=1.6.0"
 
 [tool.poetry.dev-dependencies]
 aresponses = "3.0.0"
-black = "25.1.0"
+black = "26.3.1"
 blacken-docs = "1.19.1"
 codespell = "2.4.1"
 covdefaults = "2.3.0"