Enable flake8-commas linting rules (#267)

See https://docs.astral.sh/ruff/rules/#flake8-commas-com.

src/common/endoflife.py

@@ -130,7 +130,7 @@ class Product:
         with open(self.versions_path, "w") as f:
             f.write(json.dumps(dict(
                 # sort by date then version (desc)
-                sorted(versions.items(), key=lambda x: (x[1], x[0]), reverse=True)
+                sorted(versions.items(), key=lambda x: (x[1], x[0]), reverse=True),
             ), indent=2))
 
     def __repr__(self) -> str: