Enable flake8-bugbear linting rules (#267)

See https://docs.astral.sh/ruff/rules/#flake8-bugbear-b.

src/cgit.py

@@ -9,7 +9,7 @@ Ideally we would want to use the git repository directly, but cgit-managed repos
 METHOD = "cgit"
 
 p_filter = sys.argv[1] if len(sys.argv) > 1 else None
-for product_name, configs in endoflife.list_products(METHOD, p_filter).items():
+for product_name in endoflife.list_products(METHOD, p_filter):
     product = endoflife.Product(product_name)
     print(f"::group::{product.name}")