Update syntax

Author: fabaff

pyproject.toml

@@ -26,7 +26,7 @@ python = "^3.13"
 httpx = ">=0.28,<1"
 yarl = "^1.8.0"
 
-[tool.poetry.dev-dependencies]
+[tool.poetry.group.dev.dependencies]
 pytest = "^9"
 pytest-httpx = ">0.15,<1"
 pytest-asyncio = "^0.15.1"