Check for final newline in code files

When selecting specific Ruff rules, I think we need to add W292
so that it checks for final newlines in code files.

(Might be that black is doing that in this dual setup, but maybe we
can move towards using only ruff?)

Author: martin-martin

pyproject.toml

@@ -16,5 +16,5 @@ target-version = "py312"
 exclude        = [".git", "venv", "migrations", "node_modules"]
 
 [tool.ruff.lint]
-select = ["E", "F", "I", "RUF100"]
+select = ["E", "F", "I", "RUF100", "W292"]
 ignore = ["E501"]                  # Line length is controlled by Black