Update dev dependency group name

Author: paul121

backend/app/pyproject.toml

@@ -24,7 +24,7 @@ sqlalchemy = "^1.3.16"
 farmOS = "^1.0.0-beta.3"
 uvicorn = "^0.17.4"
 
-[tool.poetry.dev-dependencies]
+[tool.poetry.group.dev.dependencies]
 mypy = "^0.770"
 black = "^22"
 isort = "^5.10"