Add Poetry and FastAPI to ecosystem checks (#6245)

Poetry in particular would be useful to avoid issues like
#6233.

scripts/check_ecosystem.py

@@ -106,17 +106,19 @@ async def _get_commit(self: Self, checkout_dir: Path) -> str:
 
 
 REPOSITORIES: list[Repository] = [
+    Repository("DisnakeDev", "disnake", "master"),
     Repository("apache", "airflow", "main", select="ALL"),
     Repository("bokeh", "bokeh", "branch-3.2", select="ALL"),
     Repository("pypa", "build", "main"),
     Repository("pypa", "cibuildwheel", "main"),
-    Repository("pypa", "setuptools", "main"),
     Repository("pypa", "pip", "main"),
+    Repository("pypa", "setuptools", "main"),
     Repository("python", "mypy", "master"),
-    Repository("DisnakeDev", "disnake", "master"),
+    Repository("python", "typeshed", "main", select="PYI"),
+    Repository("python-poetry", "poetry", "master"),
     Repository("scikit-build", "scikit-build", "main"),
     Repository("scikit-build", "scikit-build-core", "main"),
-    Repository("python", "typeshed", "main", select="PYI"),
+    Repository("tiangolo", "fastapi", "master"),
     Repository("zulip", "zulip", "main", select="ALL"),
 ]