cc5885e564
This makes caching of submodules independent of whether `Module` is itself a Salsa ingredient. In fact, this makes the work done in the prior commit superfluous. But we're possibly keeping it as an ingredient for now since it's a bit of a tedious change and we might need it in the near future. Ref https://github.com/astral-sh/ruff/pull/19495#pullrequestreview-3045736715