open-source-silicon.dev

When I do a fresh clone of the PDK, I run
```# Expect a large download! ~7GB at time of writing.
SUBMODULE_VERSION=latest make submodules -j3 || make submodules -j1

# Regenerate liberty files
make timing```
However, the spice primitives submodule doesn't get pulled (sky130_fd_pr). Is there a Makefile target for this? I don't see one...

In other words, it is not in the submodule target in scripts/git.mk for some reason.

<@U016ULGAUNM> I think that the changing of branches broke this too. I had to go in manually and pick the main branch. There is no latest branch/tag any more.