Update pyproject.toml to be poetry v1.2 compliant

Author: bckohan

pyproject.toml

@@ -45,7 +45,7 @@ enum-properties = {version = "^1.1.1", optional = true}
 django-filter = {version = "^21", optional = true}
 djangorestframework = {version = "^3.9", optional = true}
 
-[tool.poetry.dev-dependencies]
+[tool.poetry.group.dev.dependencies]
 pytest = "^7.0"
 Sphinx = "^5.0.2"
 sphinx-rtd-theme = "^1.0.0"