cargo-deny doesn't igore unpublished crate `generator` as expected

[davidB]

# The unpublished packages (generator) would be ignored now
# FIXME the generator is excluded explicitly (see Makefile), I don't know why this is not working
[licenses.private]
ignore = true

Current workaround: generator is explicitly excluded in Makefile's call

lint_cargo_deny:
	cargo deny --workspace --all-features \
		--exclude-dev \
		--exclude generator \
		check licenses advisories \
		--config=tools/cargo-deny/deny.toml