chore(deps): update dependency black to v26

Author: renovate[bot]

poetry.lock

@@ -41,7 +41,7 @@ flask-wtf = "^1.2.2"
 
 [tool.poetry.group.dev.dependencies]
 pre-commit = "4.5.1"
-black = "25.12.0"
+black = "26.1.0"
 
 [build-system]
 requires = ["poetry-core"]