Update PDBe publishing pipeline to v4

[skodapetr]

[luk27official]

I have changed this line:

prankweb/synchronization/prankweb_service.py

Line 64 in a573e17

return "v4-conservation-hmm"

it was the only place where v3 was still present, just to let you know. But a further check is needed for sure. Otherwise, I haven't changed the database schema, so it should just be a matter of naming...