We plan to unify protobuf and upb into a single Bazel repo, but for now they
are separate repos as far as Bazel is concerned. This change will make upb's
workspace depend on the local copy of protobuf so that protobuf changes take
effect immediately for builds inside upb's workspace. This also mimicks the way
that the protobuf workspace depends on upb.
PiperOrigin-RevId: 560188433
Our automation clobbered a few more files, so let's move them
temporarily so that we can put them back in place in a way that "git
blame" continues to work.
This is the second attempt to fix our Git history. This should allow
"git blame" to work correctly in the upb/ directory even though our
automation unexpectedly blew away that directory.