Support minimal lock-file updates when using pypi-dependencies

[tdejager]

Problem description

With conda we have support for minimal lock file updates. Say you have 10 packages and you only want to update foo, and none of its dependencies influence the environment the other 9 packages stay at the same version. This is convenient to minimize breaking changes, but also more efficient in downloading and caching etc.

We did not have this for pypi-options yet. UV has introduced the concept of installed packages in the solve, which hopefully means (I have not looked into this) that we can support minimal lock-file updates for pypi as well.