[poetry] Update pyproject to only install test deps when needed

We'll also need to fast follow this with a new line in the drone
file otherwise CI will fail because pytest wont be installed by default
any longer.

pyproject.toml

@@ -53,10 +53,10 @@ django-oauth-toolkit = "^3.0.1"
 meta-yt = "^0.1.9"
 berserk = "^0.13.2"
 
-[tool.poetry.group.dev]
+[tool.poetry.group.test]
 optional = true
 
-[tool.poetry.group.dev.dependencies]
+[tool.poetry.group.test.dependencies]
 Werkzeug = "2.0.3"
 black = "^22.3"
 coverage = "^7.0.5"