The individual library repositories were just moved to github a few days ago, which now allows us to create pull requests to fix these (and many other) issues. We have a plan to do so, but it will probably be a week or two before we get that underway in earnest. Meanwhile, however, anyone can now fork, e.g.,
https://github.com/google/skywater-pdk-libs-sky130_fd_sc_hd , fix the error, and submit a pull request.